Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended		3 Months Ended
	Mar. 31, 2013	Jan. 31, 2013 Q3 Contracting	Mar. 31, 2013 Q3 Contracting	Dec. 31, 2012 Q3 Contracting
Stockholders' equity
Amount received in exchange for shares of common stock under a purchase arrangement	$ 1,455
Shares of common stock issued to managers and executives under a purchase arrangement within the Long-Term Incentive Plan	131,989
Discounted price from market price at which shares purchased by participants in LTI Plan (as a percent)	75.00%
Shares of common stock issued as a part of quarterly compensation of non-employee members of the Board of Directors	12,480
Price of shares issued (in dollars per share)				$ 14.69
Stock issued to sellers (in shares)		29,273	29,273