Stockholder's Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2010
Accumulated other comprehensive income (loss)
Warrants issued (in shares)			1,481,055
Exercise Price (in dollars per share)			$ 14.00
Shares of common stock issued on exercise of warrants		12,300
Components of accumulated other comprehensive income (loss)
Balance at the beginning of the period	$ (29,388)	$ (23,947)
Other comprehensive income (loss), net of tax	153	(1,237)
Balance at the end of the period	(29,235)	(25,184)
Unrealized Gain (Loss) on Investments
Components of accumulated other comprehensive income (loss)
Balance at the beginning of the period		(64)
Other comprehensive income (loss), net of tax		2
Balance at the end of the period		(62)
Retirement plans
Components of accumulated other comprehensive income (loss)
Balance at the beginning of the period	(29,388)	(23,883)
Other comprehensive income (loss), net of tax	153	(1,239)
Balance at the end of the period	$ (29,235)	$ (25,122)