Derivative Financial Instruments (Details) - USD ($)		3 Months Ended		6 Months Ended
	Dec. 23, 2013	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Apr. 30, 2014
Derivative Liability [Abstract]
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net		$ 0		$ 0		$ 0
Gain (Loss) Recognized in AOCI (Effective Portion)		(446,000)	$ (107,000)	(1,530,000)	$ (1,672,000)
Loss Reclassified from AOCI into Operations (Effective Portion)		(441,000)	(442,000)	(883,000)	(883,000)
Loss Recognized in Operations on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)		0	0	0	0
Net deferred losses on derivative instruments expected to be reclassified to operations during the next twelve months		1,600,000		1,600,000
Interest Rate Swap [Member]
Derivatives
Derivative, Notional Amount							$ 200,000,000.0
Derivative Liability [Abstract]
Gain (Loss) Recognized in AOCI (Effective Portion)		(446,000)	(107,000)	(1,530,000)	(1,672,000)
Loss Reclassified from AOCI into Operations (Effective Portion)		(441,000)	(442,000)	(883,000)	(883,000)
Loss Recognized in Operations on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)		0	$ 0	0	$ 0
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative Liability [Abstract]
Derivative Liability, Current		1,590,000		1,590,000		1,372,000
Derivative Liability, Noncurrent		655,000		655,000		226,000
Derivative Liability		$ 2,245,000		$ 2,245,000		$ 1,598,000
Credit Facility 2011 - Term Loan B, As Amended 2013 [Member]
Derivatives
Debt Instrument, Description of Variable Rate Basis	LIBOR
Debt Instrument, Variable Rate Basis Floor	0.75%