Fair Value Measurements - Fair Value of Assets and Liabilities (Details) - Interest Rate Swap [Member] - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative assets		$ 2,539
Derivative liabilities	$ 14,016	1,135
Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Derivative assets		2,539
Derivative liabilities	$ 14,016	$ 1,135