Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended			1 Months Ended	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Jun. 30, 2012	Jan. 31, 2013 Q3 Contracting	Jun. 30, 2013 Q3 Contracting	Dec. 31, 2012 Q3 Contracting
Stockholders' equity
Amount received for shares of common stock issued under a purchase arrangement	$ 1,455	$ 1,240
Shares of common stock issued to managers and executives under a purchase arrangement within the Long-Term Incentive Plan for bonuses earned in the prior year	131,989	111,790
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
Common stock issued for acquisition			$ 980			$ 430
Price of shares issued (in dollars per share)						$ 14.69
Stock issued to sellers (in shares)				29,273	29,273