Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Recent Accounting Pronouncement) (Details)

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Summary of Significant Accounting Policies (Recent Accounting Pronouncement) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net cash provided by operating activities $ 117,385 $ 108,250 $ 83,146  
Net cash provided by (used in) financing activities 352,294 (72,083) (22,345)  
Restricted cash 158 2,000    
Accounting Standards Update 2016-09        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net cash provided by operating activities     4,455  
Net cash provided by (used in) financing activities     $ 4,455  
Accounting Standards Update 2016-18        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Restricted cash $ 326 $ 2,148    
Scenario, Forecast | Accounting Standards Update 2016-02        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Operating lease, right-of-use asset       $ 66,000
Operating lease, liability       $ 84,000