Supplementary Financial Data Supplementary Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplementary Financial Data [Abstract]
Revenue	$ 250,911	$ 208,875	$ 170,994	$ 131,125	$ 176,786	$ 141,624	$ 137,444	$ 110,570	$ 566,424	$ 761,905		$ 616,377
Gross margin (a)	47,638	43,114	33,411	23,700	28,562	23,658	17,956	7,125
Net income (loss) (b)	$ 5,015	$ 8,314	$ 3,204	$ (3,186)	$ (2,976)	$ (4,718)	$ (9,144)	$ (17,039)	$ (33,877)	$ 13,347	$ (33,877)	$ (26,269)
Earnings Per Share, Basic	$ 0.23	$ 0.43	$ 0.17	$ (0.17)	$ (0.16)	$ (0.25)	$ (0.49)	$ (0.92)	$ (1.81)	$ 0.68	$ (1.81)	$ (1.42)
Earnings Per Share, Diluted	$ 0.23	$ 0.42	$ 0.17	$ (0.17)	$ (0.16)	$ (0.25)	$ (0.49)	$ (0.92)	$ (1.81)	$ 0.67	$ (1.81)	$ (1.42)
Basic Weighted Average Shares Outstanding	21,545	19,434	18,833	18,772	18,736	18,728	18,711	18,615	18,698	19,651	18,698	18,523
Diluted Weighted Average Shares Outstanding	21,961	20,273	19,031	18,772	18,736	18,728	18,711	18,615	18,698	19,891	18,698	18,523