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Derivative Financial Instruments - Impact on Interest Expense of Interest Rate Agreements Accounted for as Cash Flow Hedges (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Total interest expense	$ (84,961)	$ (64,351)	$ (48,213)	$ (41,514)	$ (36,108)	$ (27,443)	$ (24,234)	$ (21,031)	$ (239,039)	$ (108,816)	$ (88,528)
Cash Flow Hedging | Interest Rate Contract
Derivative [Line Items]
Net interest expense on cash flows hedges									(3,228)	(4,602)	(5,317)
Realized net losses reclassified from other comprehensive income									0	(45)	(72)
Total interest expense									$ (3,228)	$ (4,647)	$ (5,389)

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Amount of interest expense recognized in earnings on cash flow hedge.

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The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Amount of the cost of borrowed funds accounted for as interest expense.

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