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Segment Information - Consolidated Total Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]        
Assets $ 3,376,293 $ 2,717,752    
Cash and cash equivalents 104,522 185,488 $ 161,020 $ 56,772
Reportable Segment        
Segment Reporting, Asset Reconciling Item [Line Items]        
Assets 3,271,771 2,532,264    
Reportable Segment | Domestic        
Segment Reporting, Asset Reconciling Item [Line Items]        
Assets 2,437,485 1,778,481    
Reportable Segment | International        
Segment Reporting, Asset Reconciling Item [Line Items]        
Assets 433,513 352,898    
Reportable Segment | Proprietary Products        
Segment Reporting, Asset Reconciling Item [Line Items]        
Assets 400,773 400,885    
Segment Reconciling Items        
Segment Reporting, Asset Reconciling Item [Line Items]        
Cash and cash equivalents $ 104,522 $ 185,488