Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current
State and local	$ (941)	$ (835)	$ (535)
Current	(941)	(835)	(535)
Deferred
Federal	6,081	8,346	(78,978)
State and local	770	1,271	(11,849)
Deferred	6,851	9,617	(90,827)
Total income tax expense (benefit)	5,910	8,782	(91,362)
Statutory federal income tax rate (as a percent)	34.00%
Increase (decrease) resulting from:
Income tax (benefit) at federal rate	4,763	6,552	6,331
State income taxes, net of federal income tax benefit	592	814	774
Permanent difference for compensation limitation	595	575	271
Expense reflected in tax basis	415
Tax credit included in taxable income	327	320	204
Other permanent differences	47	931	26
Capital goods excise tax credit	(942)	(836)	(535)
Other, net	51	6
Change in valuation allowance	62	420	(98,433)
Total income tax expense (benefit)	$ 5,910	$ 8,782	$ (91,362)