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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2014
Stock Only Stock Appreciation Rights (SOSARs) [Member] |
Summary of Stock Option Activity | The following table sets forth information related to outstanding SOSARS:
|  | 2014 |  |  | 2013 |  |  | 2012 |
SOSARS |  |  | Shares |  |  |  | Wtd Avg Exercise Price |  |  |  | Shares |  |  |  | Wtd Avg Exercise Price |  |  |  | Shares |  |  |  | Wtd Avg Exercise Price |
Outstanding at January 1, |  |  | 1,977,133 |  |  | $ | 13.91 |  |  |  | 2,121,454 |  |  | $ | 12.93 |  |  |  | 2,298,288 |  |  | $ | 12.35 |
Granted |  |  | 281,881 |  |  |  | 29.78 |  |  |  | 368,687 |  |  |  | 18.51 |  |  |  | 364,114 |  |  |  | 15.58 |
Exercised |  |  | (364,465 | ) |  |  | 13.99 |  |  |  | (435,562 | ) |  |  | 12.63 |  |  |  | (500,074 | ) |  |  | 12.06 |
Canceled / forfeited |  |  | (29,842 | ) |  |  | 19.36 |  |  |  | (77,446 | ) |  |  | 16.28 |  |  |  | (40,874 | ) |  |  | 14.31 |
Outstanding at December 31, |  |  | 1,864,707 |  |  | $ | 16.20 |  |  |  | 1,977,133 |  |  | $ | 13.91 |  |  |  | 2,121,454 |  |  | $ | 12.93 |
Exercisable at December 31, |  |  | 1,285,998 |  |  |  | 12.94 |  |  |  | 1,330,816 |  |  |  | 12.58 |  |  |  | 1,469,537 |  |  |  | 12.30 |
Vested and expected to vest |  |  | 1,754,295 |  |  |  |  |  |  |  | 1,863,244 |  |  |  |  |  |  |  | 2,055,599 |  |  |  |  |
SOSAR Grants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value per share |  | $ | 9.81 |  |  |  |  |  |  | $ | 5.74 |  |  |  |  |  |  | $ | 4.94 |  |  |  |  |
Aggregate grant date fair value (in thousands) |  | $ | 2,764 |  |  |  |  |  |  | $ | 2,103 |  |  |  |  |  |  | $ | 1,797 |  |  |  |  |
Black-Scholes assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend yield |  |  | 1.48 | % |  |  |  |  |  |  | 2.16 | % |  |  |  |  |  |  | 2.31 | % |  |  |  |
Risk free rate of return |  |  | 1.74 | % |  |  |  |  |  |  | 1.01 | % |  |  |  |  |  |  | 1.02 | % |  |  |  |
Volatility |  |  | 37.59 | % |  |  |  |  |  |  | 39.58 | % |  |  |  |  |  |  | 41.48 | % |  |  |  |
Expected life |  |  | 6 yrs |  |  |  |  |  |  |  | 6 yrs |  |  |  |  |  |  |  | 6 yrs |  |  |  |  |
Compensation expense (in thousands) |  | $ | 2,086 |  |  |  |  |  |  | $ | 1,591 |  |  |  |  |  |  | $ | 1,448 |  |  |  |  |
Restricted Stock Units (RSU) and Performance Share Awards (PSAs) [Member] |
Summary of Stock Option Activity | The following table summarizes RSU and PSA activity during the past three years:
Units |  |  | 2014 |  |  |  | 2013 |  |  |  | 2012 |
Balance at January 1, |  |  | 1,001,814 |  |  |  | 847,679 |  |  |  | 788,088 |
Granted |  |  | 178,882 |  |  |  | 315,196 |  |  |  | 209,021 |
Forfeited |  |  | (47,379 | ) |  |  | (47,831 | ) |  |  | (52,800 | )
Shares delivered |  |  | (244,375 | ) |  |  | (113,230 | ) |  |  | (96,630 | )
Balance at December 31, |  |  | 888,942 |  |  |  | 1,001,814 |  |  |  | 847,679 |
Compensation Expense for Stock Option Activity |
|  |  | 2014 |  |  |  | 2013 |  |  |  | 2012 |
Compensation expense |  | $ | 2,652 |  |  | $ | 2,882 |  |  | $ | 2,576 |

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