Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Components of comprehensive income
Net income	$ 2,559	$ 5,718	$ 4,924	$ 10,210
Minimum pension liability adjustments	946		946
Reclassification to interest expense	487	237	678	485
Deferred income tax expense	(520)	(79)	(585)	(163)
Mark to market of interest rate hedges	(2)	(19)	(15)	(37)
Comprehensive income	$ 3,470	$ 5,857	$ 5,948	$ 10,495
Accumulated other comprehensive loss
Mark to market of interest rate hedges, net of tax benefit					$ (422)
Minimum pension liability adjustments, net of tax benefit					(602)
Accumulated other comprehensive loss					$ (1,024)