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Basis of Presentation (Details Textual)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
segment
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Number of reportable segments | segment   4    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Unrecognized excess tax benefits recognized as current tax expense $ 300 $ 2,600    
Operating activities in Condensed Consolidated Statements of Cash Flow   54,014 $ 86,231  
Financing activities in Condensed Consolidated Statements of Cash Flow   (308,969) $ (85,888)  
Accounting Standards Update 2016-09 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative-effect adjustment- ASU 2016-09 adoption [1]       $ 149
Operating activities in Condensed Consolidated Statements of Cash Flow   2,300    
Financing activities in Condensed Consolidated Statements of Cash Flow   $ (2,300)    
Accounting Standards Update 2016-09 [Member] | Additional Paid-in Capital [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative-effect adjustment- ASU 2016-09 adoption [1]       425
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative-effect adjustment- ASU 2016-09 adoption [1]       $ (276)
[1] See Note 1 of the Notes to Condensed Consolidated Financial Statements for discussion of accounting guidance adopted during the period.