Quarterly report pursuant to Section 13 or 15(d)

Description of Business and Basis of Presentation - (Details)

v3.8.0.1
Description of Business and Basis of Presentation - (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Tax benefit from share based compensation   $ 4,458
Forfeitures for share-based compensation   63
Tax benefit for share-based compensation forfeitures   $ 12
Accounting Standards Update 2016-09    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Tax benefit related to excluded windfall deductions $ 4,446