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Debt Obligations, net (Future Scheduled Maturities) (Details) - USD ($) $ in Thousands	2 Months Ended
	Feb. 25, 2019	Dec. 31, 2018	Dec. 31, 2017
Maturities of Long-term Debt [Abstract]
2019		$ 375,434
2020		400,000
2021		436,914
2022		1,111,468
2023		646,750
Thereafter		691,051
Total principal maturities		3,661,617	$ 3,539,991
Debt discounts and deferred financing costs, net		(52,531)	(63,591)
Debt obligations, net		3,609,086	3,476,400
Unsecured Debt
Maturities of Long-term Debt [Abstract]
2019		375,000
2020		400,000
2021		275,000
2022		1,062,500
2023		0
Thereafter		100,000
Total principal maturities		2,212,500
Debt discounts and deferred financing costs, net		(41,267)
Debt obligations, net		2,171,233
Unsecured Notes
Maturities of Long-term Debt [Abstract]
Total principal maturities		2,112,500	2,507,500
Unsecured Notes | 5.00% senior notes
Maturities of Long-term Debt [Abstract]
Total principal maturities		375,000	770,000
Unsecured Notes | 5.00% senior notes | Subsequent Event
Maturities of Long-term Debt [Abstract]
Aggregate principal amount called for redemption	$ 375,000
Secured Debt
Maturities of Long-term Debt [Abstract]
2019		434
2020		0
2021		161,914
2022		48,968
2023		646,750
Thereafter		591,051
Total principal maturities		1,449,117	$ 932,491
Debt discounts and deferred financing costs, net		(11,264)
Debt obligations, net		$ 1,437,853

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