Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | Note 8 – Stock-Based Compensation Under the 2012 Long-Term Incentive Plan (2012 Plan), the Company has the ability to grant stock options, stock appreciation rights (SARs), restricted stock, stock units, other stock-based awards and cash incentive awards. Awards under the 2012 Plan will have a maximum term of ten years from the date of grant. The compensation committee may provide that the vesting or payment of any award will be subject to the attainment of specified performance measures in addition to the satisfaction of any continued service requirements and the compensation committee will determine whether such measures have been achieved. The per share exercise price of stock options and SARs granted under the 2012 Plan generally may not be less than the fair market value of a share of our common stock on the date of the grant. Employee Stock Purchase Plan The Company’s 2012 Employee Stock Purchase Plan (ESPP) allows eligible employees to purchase shares of the Company’s common stock at a discount through payroll deductions of up to 15 percent of their eligible compensation, subject to plan limitations. The ESPP provides for six-month offering periods ending May 15 and November 15, respectively. At the end of each offering period, employees are able to purchase shares at 85 percent of the lower of the fair market value of the Company’s common stock on the first trading day of the offering period or on the last trading day of the offering period. Stock-Based Compensation Expense Stock-based compensation expense was $1.6 million and $1.2 million for the three months ended June 30, 2015 and 2014, respectively, and $2.9 million and $2.2 million for the six months ended June 30, 2015 and 2014, respectively. Stock Options A summary of stock option activity during the six months ended June 30, 2015 is as follows: Weighted- Average Stock Options Exercise Price Options outstanding at December 31, 2014 998,987 $ 26.49 Granted 110,335 67.36 Exercised (86,656 ) 15.72 Forfeited (25,713 ) 52.39 Options outstanding at June 30, 2015 996,953 $ 31.28 Exercisable at June 30, 2015 515,568 $ 19.12 The outstanding options generally have a term of ten years. For employees, options granted become exercisable ratably over the vesting period, which is generally a five-year period beginning on the first anniversary of the grant date, subject to the employee’s continuing service to the Company. For directors, options generally become exercisable in full on the first anniversary of the grant date. The weighted-average grant date fair value of options that were granted during the six months ended June 30, 2015 was $32.42. The following table provides the assumptions used in the Black-Scholes pricing model valuation of options during the six months ended June 30, 2015 and 2014, respectively: Six Months Ended June 30, 2015 2014 Risk-free interest rate 1.69 - 1.77% 0.43 - 2.14% Expected life (years) 5.50 - 6.50 2.00 - 6.50 Expected volatility 46.80 - 47.23% 48.87 - 49.30% Expected dividend yield 0% 0% As of June 30, 2015, there was $8.8 million of unrecognized compensation expense related to unvested stock options, which is expected to be recognized over a weighted-average period of 3.3 years . Restricted Stock The 2012 Plan provides for the award of restricted stock or restricted stock units. Restricted stock awards are share settled awards and restrictions lapse ratably over the vesting period, which is generally a five-year period, beginning on the first anniversary of the grant date, subject to the employee's continuing service to the Company. For directors, restricted stock awards generally vest in full on the first anniversary of the grant date. A summary of restricted stock activity during the six months ended June 30, 2015 is as follows: Weighted- Average Grant Date Restricted Fair Value Stock Per Share Nonvested restricted stock at December 31, 2014 76,574 $ 69.27 Granted 68,580 68.89 Vested (16,161 ) 69.47 Forfeited (1,858 ) 78.59 Nonvested restricted stock at June 30, 2015 127,135 $ 68.90 As of June 30 , 2015, there was $7.9 million of unrecognized compensation expense related to non-vested restricted stock, which is expected to be recognized over a weighted-average period of 4.1 years. Employee Stock Purchase Plan The following table presents the assumptions used to estimate the fair value of the ESPP during the six months ended June 30 , 2015 and 2014, respectively: Six Months Ended June 30, 2015 2014 Risk-free interest rate 0.08 - 0.10% 0.01 - 0.11% Expected life (months) 6.00 6.00 Expected volatility 33.68 - 37.64% 39.16 - 39.80% Expected dividend yield 0% 0% |