XML 100 R82.htm IDEA: XBRL DOCUMENT v3.8.0.1
Commitments and Contingencies (Minimum Lease Obligations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Leased Assets [Line Items]      
2015 $ 20,642    
2016 17,826    
2017 15,325    
2018 14,330    
2019 13,884    
Thereafter 314,391    
Lease obligations 396,398    
Selling, General and Administrative Expenses      
Operating Leased Assets [Line Items]      
Lease expense during the period $ 30,300 $ 31,000 $ 29,000