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Stock Options, Restricted Stock and Restricted Stock Units - Tax shortfall (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Schedule of information regarding share-based payment arrangements |  |  |  |
Tax shortfall from vesting of restricted shares |  |  |  | $ 50
Provision for income taxes | $ 3,645 | $ 5,062 | $ 11,532 | $ 12,674
Scenario, Adjustment [Member] | Accounting Standards Update 2016 09 |  |  |  |
Schedule of information regarding share-based payment arrangements |  |  |  |
Provision for income taxes |  |  | $ 600 |

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