Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Stockholders' Equity Note [Abstract] | ||||
| Stock-based compensation expense | $ 4,066 | $ 3,867 | $ 12,044 | $ 11,476 |
| Less: Deferred tax benefit | (1,466) | (1,425) | (4,235) | (4,084) |
| Stock-based compensation expense, net of tax | $ 2,600 | $ 2,442 | $ 7,809 | $ 7,392 |