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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Statement of Cash Flows [Abstract]        
Cash $ 254,843 $ 259,655 $ 299,888  
Restricted cash and equivalents included in Other assets:        
Debt service accounts 22,454 33,726 38,753  
Other restricted cash 3,056 9,179 11,257  
Total cash and restricted cash reported in the statements of cash flows $ 280,353 $ 302,560 $ 349,898 $ 302,398