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Notes and Loan Payable and Amounts Due Under Repurchase Agreements Notes and Loan Payable and Amounts Due Under Repurchase Agreements (2027 Notes Narrative) (Details) (Details) - USD ($) $ in Thousands			3 Months Ended				12 Months Ended
	Jul. 17, 2017	Jun. 16, 2017	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Extinguishment of debt, cash paid							$ 0	$ 413,252	$ 0
Loss on extinguishment of debt			$ 0	$ 18,389	$ 428	$ 0	0	18,817	$ 0
June 2027 Notes
Debt Instrument [Line Items]
Debt instrument, face amount		$ 500,000	500,000				500,000	500,000
Interest rate		5.00%
Unamortized discount		$ 300	$ 335				$ 307	$ 335
Deferred financing costs		5,800
Term Loan
Debt Instrument [Line Items]
Extinguishment of debt, amount		$ 100,000
July 2021 Notes
Debt Instrument [Line Items]
Extinguishment of debt, amount	$ 400,000
Extinguishment of debt, cash paid	$ 413,300
Debt instrument, redemption price, percentage	3.313%
Loss on extinguishment of debt	$ 18,400

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