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Segment Information - Consolidated Total Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting, Asset Reconciling Item [Line Items]        
Assets $ 2,777,840 $ 2,735,406    
Cash and cash equivalents 161,020 56,772 $ 101,905 $ 97,888
Reportable Segment        
Segment Reporting, Asset Reconciling Item [Line Items]        
Assets 2,616,820 2,678,634    
Reportable Segment | Domestic Segment        
Segment Reporting, Asset Reconciling Item [Line Items]        
Assets 2,155,236 2,139,972    
Reportable Segment | International Segment        
Segment Reporting, Asset Reconciling Item [Line Items]        
Assets 461,584 538,662    
Segment Reconciling Items        
Segment Reporting, Asset Reconciling Item [Line Items]        
Cash and cash equivalents $ 161,020 $ 56,772