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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Statement of Cash Flows [Abstract]        
Cash $ 285,653 $ 259,655 $ 268,320  
Debt service accounts 27,496 33,726 43,268  
Other restricted cash 9,278 9,179 6,173  
Total cash and restricted cash reported in the statements of cash flows $ 322,427 $ 302,560 $ 317,761 $ 302,398