Stock-Based Compensation (Details Textual) (USD $) | 3 Months Ended | 1 Months Ended | 3 Months Ended | | 3 Months Ended |
In Millions, except Share data, unless otherwise specified | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 | Mar. 31, 2013 | Jun. 30, 2012 | Mar. 31, 2014 | Jun. 19, 2012 | Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 | Mar. 31, 2014 |
| compensation_plan | The Plans [Member] | The Plans [Member] | Employee Group [Member] | Employee Group [Member] | Director Group [Member] | Director Group [Member] | Performance Shares [Member] | Performance Shares [Member] | Performance Shares [Member] | Restricted Stock and Restricted Stock Units [Member] | Restricted Stock and Restricted Stock Units [Member] | Restricted Stock and Restricted Stock Units [Member] | Stock Options [Member] | Stock Options [Member] | Stock Options [Member] | Stock Options [Member] |
| | | | | 2008 Equity Incentive Plan [Member] | | 2008 Equity Incentive Plan [Member] | 2006 Management Incentive Plan [Member] | 2006 Management Incentive Plan [Member] | 2006 Management Incentive Plan [Member] | 2008 Equity Incentive Plan [Member] | Employee Group [Member] | Director [Member] | 2008 Equity Incentive Plan [Member] | 2008 Equity Incentive Plan [Member] | 2008 Equity Incentive Plan [Member] | Director [Member] |
| | | | | | | | | executive_officer | | | 2008 Equity Incentive Plan [Member] | 2008 Equity Incentive Plan [Member] | | | | 2008 Equity Incentive Plan [Member] |
Stock-Based Compensation (Textual) [Abstract] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Number of stock-based compensation plans | 3 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Stock options expiration period | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | '7 years | ' | ' | ' |
Stock options vesting period | ' | ' | ' | '3 years | '3 years | '1 year | ' | ' | ' | ' | ' | '3 years | '1 year | ' | ' | '3 years | '1 year |
Stock options award vesting right | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 'vest in equal annual increments over the vesting period | ' | ' | 'vest in equal annual increments over the vesting period | ' | ' | ' |
No. of Options Granted (shares) | ' | ' | ' | ' | 5,000 | ' | 7,122 | ' | ' | ' | ' | ' | ' | ' | 0 | ' | ' |
Total of performance units were outstanding and fully vested (shares) | ' | ' | ' | ' | ' | ' | ' | ' | 44,076 | 154,264 | ' | ' | ' | ' | ' | ' | ' |
Grant date fair value awards | ' | ' | ' | ' | ' | ' | ' | $1.20 | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Percentage of performance units (percent) | ' | ' | ' | ' | ' | ' | ' | ' | 60.00% | ' | ' | ' | ' | ' | ' | ' | ' |
Percentage of fair market value (percent) | ' | ' | ' | ' | ' | ' | ' | ' | 40.00% | ' | ' | ' | ' | ' | ' | ' | ' |
Performance units settled in period (shares) | ' | ' | ' | ' | ' | ' | ' | ' | 93,664 | ' | ' | ' | ' | ' | ' | ' | ' |
Number of executive officers that settled performance units in period (executive officers) | ' | ' | ' | ' | ' | ' | ' | ' | 4 | ' | ' | ' | ' | ' | ' | ' | ' |
Number of former executive officers that settled performance units in period (executive officers) | ' | ' | ' | ' | ' | ' | ' | ' | 2 | ' | ' | ' | ' | ' | ' | ' | ' |
Performance units forfeited in period (shares) | ' | ' | ' | ' | ' | ' | ' | ' | 16,524 | ' | ' | ' | ' | ' | ' | ' | ' |
Number of former executive officers that forfeited performance units in period (executive officer) | ' | ' | ' | ' | ' | ' | ' | ' | 1 | ' | ' | ' | ' | ' | ' | ' | ' |
Common stock issued during period (shares) | ' | ' | ' | ' | ' | ' | ' | ' | 56,197 | ' | ' | ' | ' | ' | ' | ' | ' |
Cash payments for shares settled during period | ' | ' | ' | ' | ' | ' | ' | ' | 0.2 | ' | ' | ' | ' | ' | ' | ' | ' |
Selling, general and administrative expenses | ' | 1 | 1.3 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Unrecognized stock-based compensation expense related to stock options | ' | $5.50 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Weighted-average period for recognizing stock compensation expense | ' | '1 year 8 months 13 days | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |