Stock Incentives (Details) (USD $) | 3 Months Ended | 6 Months Ended | 1 Months Ended | | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Apr. 30, 2014 | Apr. 30, 2014 | Apr. 30, 2014 | Apr. 30, 2014 | Apr. 30, 2014 | Apr. 30, 2014 | Apr. 30, 2014 | Apr. 30, 2014 | Apr. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | 31-May-14 | 31-May-13 | Feb. 28, 2013 | Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2013 | 14-May-14 | Feb. 14, 2014 | Jan. 14, 2014 | 14-May-14 | Feb. 14, 2014 | Jan. 14, 2014 | 14-May-14 | Feb. 14, 2014 | Jan. 14, 2014 | 14-May-14 | Feb. 14, 2014 | Jan. 14, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 |
Options | Options | Options | Options | Options | Options | Options | Options | Options | Options | Options | Options | Options | Time-Based Vesting Conditions | Time-Based Vesting Conditions | Time-Based Vesting Conditions | Time-Based Vesting Conditions | Time-Based Vesting Conditions | Time-Based Vesting Conditions | Time-Based Vesting Conditions | Time-Based Vesting Conditions | Market-Based Vesting Conditions | Market-Based Vesting Conditions | Market-Based Vesting Conditions | Market-Based Vesting Conditions | Market-Based Vesting Conditions | Market-Based Vesting Conditions | Market-Based Vesting Conditions | Market-Based Vesting Conditions | Market-Based Vesting Conditions | Market-Based Vesting Conditions | Market-Based Vesting Conditions | Market-Based Vesting Conditions | Market-Based Vesting Conditions | Market-Based Vesting Conditions | Market-Based Vesting Conditions | Market-Based Vesting Conditions | Market-Based Vesting Conditions | Market-Based Vesting Conditions | Market-Based Vesting Conditions | Market-Based Vesting Conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions | Stock options with President and market-based vesting conditions |
| | | | President and Chief Executive Officer | President and Chief Executive Officer | President and Chief Executive Officer | President and Chief Executive Officer | President and Chief Executive Officer | President and Chief Executive Officer | President and Chief Executive Officer | President and Chief Executive Officer | President and Chief Executive Officer | | | | | Board of Directors and Management | Board of Directors and Management | Board of Directors and Management | Board of Directors and Management | | | Management | Management | Management | Management | Management | Management | Management | Management | Management | Management | Management | Management | Management | Management | Management | Management | Management | Management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management | President and certain members of management |
| | | | | Share price equivalent $34.788 | Share price equivalent $42.350 | Share price equivalent $51.425 | Share price equivalent $60.500 | Minimum | Minimum | Minimum | Minimum | | | | | | | | | | | tranch | | Tranche 1 | Tranche 1 | Tranche 1 | Tranche 2 | Tranche 2 | Tranche 2 | Tranche 3 | Tranche 3 | Tranche 3 | Tranche 4 | Tranche 4 | Tranche 4 | Minimum | Minimum | Minimum | Minimum | | | Subsequent event | Subsequent event | Subsequent event | Subsequent event | Subsequent event | Tranche 1 | Tranche 1 | Tranche 1 | Tranche 1 | Tranche 1 | Tranche 2 | Tranche 2 | Tranche 2 | Tranche 2 | Tranche 2 | Tranche 2 | Tranche 3 | Tranche 3 | Tranche 3 | Tranche 3 | Tranche 3 | Tranche 3 | Tranche 3 | Tranche 4 | Tranche 4 | Tranche 4 | Tranche 4 | Tranche 4 | Tranche 4 | Tranche 4 |
| | | | | | | | | Share price equivalent $34.788 | Share price equivalent $42.350 | Share price equivalent $51.425 | Share price equivalent $60.500 | | | | | | | | | | | | | | | | | | | | | | | | | Share price equivalent $34.788 | Share price equivalent $42.350 | Share price equivalent $51.425 | Share price equivalent $60.500 | | | Forecast | Forecast | Forecast | Forecast | Forecast | | | Subsequent event | Subsequent event | Subsequent event | | | Subsequent event | Subsequent event | Subsequent event | Subsequent event | | | Subsequent event | Subsequent event | Subsequent event | Subsequent event | Subsequent event | | | Subsequent event | Subsequent event | Subsequent event | Subsequent event | Subsequent event |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Tranche 1 | Tranche 2 | Tranche 3 | Tranche 4 | | | | | | | | | | Forecast | Forecast | Forecast | | | Forecast | Forecast | Forecast | Forecast | | | Forecast | Forecast | Forecast | Forecast | Forecast | | | Forecast | Forecast | Forecast | Forecast | Forecast |
Stock Incentives | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Number of shares which may be issued pursuant to the Plan | 400,000 | ' | 400,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Number of shares available for issuance under the Plan | 355,000 | ' | 355,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Number of shares | ' | ' | ' | ' | 400,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 5,000 | 35,000 | 40,000 | 3,750 | ' | ' | 145,000 | 0 | 1,250 | 25,000 | 10,000 | 1,250 | 25,000 | 10,000 | 1,250 | 25,000 | 10,000 | 1,250 | 25,000 | 10,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Exercise Price (in dollars per share) | ' | ' | ' | ' | $30.25 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | $30.09 | $29.65 | $22.95 | $21.70 | ' | ' | ' | ' | $28.18 | $30.88 | $31.13 | $28.18 | $30.88 | $31.13 | $28.18 | $30.88 | $31.13 | $28.18 | $30.88 | $31.13 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Grant Date Fair Value (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | $7.67 | $7.50 | $5.28 | $5.68 | ' | ' | ' | ' | $5.06 | $5.51 | $5.64 | $4.74 | $5.35 | $5.46 | $4.02 | $4.88 | $5.03 | $3.29 | $4.15 | $4.27 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Risk-Free Interest Rate (as a percent) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 2.63% | 2.62% | 1.87% | 2.02% | ' | ' | ' | ' | 2.03% | 1.98% | 1.98% | 2.03% | 1.98% | 1.98% | 2.03% | 1.98% | 1.98% | 2.03% | 1.98% | 1.98% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Estimated Volatility (as a percent) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 41.00% | 41.00% | 43.00% | 43.00% | ' | ' | ' | ' | 31.00% | 31.00% | 31.00% | 31.00% | 31.00% | 31.00% | 31.00% | 31.00% | 31.00% | 31.00% | 31.00% | 31.00% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Dividend Yield (as a percent) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 4.65% | 4.72% | 5.88% | 4.61% | ' | ' | ' | ' | 4.70% | 4.60% | 4.50% | 4.70% | 4.60% | 4.50% | 4.70% | 4.60% | 4.50% | 4.70% | 4.60% | 4.50% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Expected Life | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | '5 years | '5 years | '5 years | '5 years | ' | ' | ' | ' | '5 years 4 months 10 days | '5 years 2 months 1 day | '5 years 1 month 24 days | '5 years 9 months 11 days | '5 years 7 months 6 days | '5 years 6 months 29 days | '6 years 1 month 20 days | '5 years 11 months 26 days | '5 years 11 months 19 days | '6 years 4 months 20 days | '6 years 3 months 7 days | '6 years 3 months | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Derived Service Period | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | '8 months 16 days | '4 months 6 days | '3 months 22 days | '1 year 6 months 22 days | '1 year 2 months 8 days | '1 year 1 month 24 days | '2 years 3 months 14 days | '1 year 11 months 23 days | '1 year 11 months 8 days | '2 years 9 months 14 days | '2 years 6 months 14 days | '2 years 6 months | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Number of equal tranches in which options will become exercisable | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 4 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Consecutive business days at any point during specified period for which the Company's common stock closed at specified prices | ' | ' | ' | ' | '3 days | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | '3 days | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Share price required to achieve vesting (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | ' | ' | $34.79 | $42.35 | $51.42 | $60.50 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | $34.79 | $42.35 | $51.42 | $60.50 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Expiration period of unvested portion of options | ' | ' | ' | ' | '5 years | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | '5 years | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Termination period of options | ' | ' | ' | ' | '10 years | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | '10 years | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Compensation expense recognized | $992,000 | $236,000 | $1,143,000 | $285,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | $302,000 | $236,000 | $306,000 | $285,000 | ' | ' | ' | ' | $690,000 | $837,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | $690,000 | $147,000 | $270,000 | $464,000 | $202,000 | $751,000 | $1,571,000 | $423,000 | $96,000 | $2,000 | $196,000 | $717,000 | $141,000 | $26,000 | $142,000 | $142,000 | $247,000 | $451,000 | $76,000 | $15,000 | $75,000 | $76,000 | $60,000 | $305,000 | $242,000 | $50,000 | $10,000 | $51,000 | $50,000 | $142,000 | $199,000 | $161,000 |
Percentage of the purchase price for the Option | ' | ' | ' | ' | ' | 115.00% | 140.00% | 170.00% | 200.00% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Number of options used to estimate grant date fair value of each tranche (in shares) | ' | ' | ' | ' | 100,000 | 100,000 | 100,000 | 100,000 | 100,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |