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Other Balance Sheet Items (Components Of Accounts Payable And Accrued Liabilities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]    
Accounts payable $ 8,921 $ 20,923
Accrued employee compensation 25,935 51,481
Deposits, net 58,190 63,617
Interest Payable, Current 40,895 47,357
Taxes Payable, Current 16,119 13,477
Other accrued liabilities 31,507 22,748
Total accounts payable and accrued liabilities $ 181,567 $ 219,603