Derivative - Schedule of Interest Rate Swap Agreements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Notional Amount	$ 2,696,100	$ 2,350,759
1.3250% Interest Rate Swap
Derivative [Line Items]
Effective Date	Jun. 30, 2015
Maturity Date	Dec. 31, 2019
Notional Amount	$ 300,000
Fixed Rate	1.512%
Variable Rate	1 Month LIBOR
1.5120% Interest Rate Swap
Derivative [Line Items]
Effective Date	Mar. 08, 2016
Maturity Date	Feb. 27, 2026
Notional Amount	$ 175,000
Fixed Rate	1.5995%
Variable Rate	1 Month LIBOR
1.5995% Interest Rate Swap
Derivative [Line Items]
Effective Date	Mar. 08, 2016
Maturity Date	Feb. 27, 2026
Notional Amount	$ 175,000
Fixed Rate	1.589%
Variable Rate	1 Month LIBOR