Fair Value Measurements - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Net unrealized gain (loss) on derivative designated as cash flow hedge			$ (27,700,000)		$ 8,300,000
Loss expected to be reclassified into interest expense within the next 12 months			6,300,000
Net unrealized loss (gain) on derivative financial instruments not designated as cash flow hedges	$ 2,000	$ 287,000	$ 50,000	$ (1,264,000)