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Restricted Cash (Schedule Of Cash, Cash Equivalents And Restricted Cash) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Restricted Cash And Cash Equivalents Items [Line Items]        
Cash and cash equivalents $ 164,521 $ 146,109    
Restricted cash - short term 30,093 36,786    
Total cash, cash equivalents, and restricted cash 197,193 185,970 $ 162,636 $ 146,619
Securitization Escrow Accounts [Member] | Restricted Cash - Current Asset [Member]        
Restricted Cash And Cash Equivalents Items [Line Items]        
Restricted cash - short term 29,916 36,607    
Payment and Performance Bonds [Member] | Restricted Cash - Current Asset [Member]        
Restricted Cash And Cash Equivalents Items [Line Items]        
Restricted cash - short term 177 179    
Surety Bonds and Workers Compensation [Member] | Other Assets - Noncurrent [Member]        
Restricted Cash And Cash Equivalents Items [Line Items]        
Restricted cash - long term $ 2,579 $ 3,075