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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Statement of Cash Flows [Abstract]        
Cash $ 228,412 $ 259,655 $ 251,472  
Restricted cash and equivalents included in Other assets:        
Debt service accounts 24,278 33,726 40,968  
Other restricted cash 3,412 9,179 6,770  
Total cash and restricted cash reported in the statements of cash flows $ 256,102 $ 302,560 $ 299,210 $ 302,398