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Basis of Presentation, Significant Accounting Policies, and Recently Issued Accounting Standards Recently Issued Accounting Standards (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Retained earnings $ 906,515 $ 794,020
ASU 2016-09 Cumulative Effect Adjustment for Timing of Recognition of Excess Tax Benefits [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Retained earnings 44,300  
ASU 2016-09 Cumulative Effect of Actual Forfeiture Rate [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Retained earnings $ (700)