Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ (68)	$ (16,785)
Amount reclassified from accumulated other comprehensive loss	(2,654)	(2,453)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	0	$ 0
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 10,500
Derivative $33M Swap [Member]
Derivative [Line Items]
Derivative, Inception Date	Dec. 01, 2016
Derivative, Maturity Date	Nov. 01, 2023
Derivative, Notional Amount	$ 33,000
Derivative, Description of Variable Rate Basis	1 Month LIBOR
Derivative, Fixed Interest Rate	1.49%
Interest Rate Cash Flow Hedge Asset at Fair Value	$ (1,101)		$ (1,013)
Derivative @ 1.048% 200K [Member]
Derivative [Line Items]
Derivative, Inception Date	Aug. 01, 2016
Derivative, Maturity Date	Jan. 05, 2022
Derivative, Notional Amount	$ 265,000
Derivative, Description of Variable Rate Basis	1 Month LIBOR with Floor
Derivative, Fixed Interest Rate	1.053%
Interest Rate Cash Flow Hedge Asset at Fair Value	$ (10,469)		(9,889)
Derivative @ 2.196% 28.1M [Member]
Derivative [Line Items]
Derivative, Inception Date	Oct. 16, 2013
Derivative, Maturity Date	Oct. 16, 2020
Derivative, Notional Amount	$ 28,100
Derivative, Description of Variable Rate Basis	1 Month LIBOR
Derivative, Fixed Interest Rate	2.196%
Interest Rate Cash Flow Hedge Liability at Fair Value	$ (440)		(580)
Derivative $300M Term [Member]
Derivative [Line Items]
Derivative, Inception Date	Apr. 03, 2017
Derivative, Maturity Date	Dec. 02, 2020
Derivative, Notional Amount	$ 300,000
Derivative, Description of Variable Rate Basis	1 Month LIBOR with Floor
Derivative, Fixed Interest Rate	1.824%
Interest Rate Cash Flow Hedge Liability at Fair Value	$ (593)		0
Swap [Member]
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 8,400
Derivative @ 1.30250% 20.0M [Member]
Derivative [Line Items]
Derivative, Inception Date	Apr. 07, 2016
Derivative, Maturity Date	Apr. 01, 2023
Derivative, Notional Amount	$ 20,000
Derivative, Description of Variable Rate Basis	1 Month LIBOR
Derivative, Fixed Interest Rate	1.3025%
Interest Rate Cash Flow Hedge Asset at Fair Value	$ (770)		(720)
Fair Value, Measurements, Recurring [Member]
Derivative [Line Items]
Interest Rate Cash Flow Hedge Asset at Fair Value	(12,340)		(11,622)
Interest Rate Cash Flow Hedge Liability at Fair Value	(1,033)		(580)
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Derivative [Line Items]
Interest Rate Cash Flow Hedge Asset at Fair Value	(12,340)		(11,622)
Interest Rate Cash Flow Hedge Liability at Fair Value	(1,033)		(580)
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net	$ 11,307		$ 11,042