Interest Rate Contracts - Summary of Interest Rate Swaps (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Fair value of interest rate swap in a net liability position	$ (23,250,000)	$ (6,394,000)
Current notional amount	$ 1,025,000,000	425,000,000
Interest Rate Swap Effective Date July 9, 2015
Derivative [Line Items]
Interest Strike Rate	1.687%
Fair value of interest rate swap in a net liability position	$ (12,187,000)	(4,305,000)
Current notional amount	$ 425,000,000	425,000,000
Interest Rate Swap Effective Date January 1, 2016
Derivative [Line Items]
Interest Strike Rate	1.32%
Fair value of interest rate swap in a net liability position	$ (2,956,000)	(1,605,000)
Current notional amount	$ 300,000,000	0
Interest Rate Swap Effective Date July, 1 2016
Derivative [Line Items]
Interest Strike Rate	1.495%
Fair value of interest rate swap in a net liability position	$ (1,290,000)	(484,000)
Current notional amount	$ 100,000,000	0
Interest Rate Swap Effective Date May 31, 2016
Derivative [Line Items]
Interest Strike Rate	1.811%
Fair value of interest rate swap in a net liability position	$ (6,817,000)	0
Current notional amount	$ 200,000,000	$ 0