Quarterly Results (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Selected Quarterly Financial Information [Abstract]
Revenues from continuing operations	$ 156,963	$ 140,877	$ 138,904	$ 143,279	$ 154,552	$ 153,826	$ 153,554	$ 145,506	$ 580,023	$ 607,438	$ 730,133
Net earnings from continuing operations	(42,840)	7,799	6,915	8,501	12,211	11,556	11,219	6,662	(19,625)	41,648	23,865
Net loss from discontinued operations	$ (1)	$ 0	$ (1)	$ (1)	$ (198)	$ (186)	$ (160)	$ (230)	$ (3)	$ (774)	$ (673)
Weighted average shares:
Basic (in shares)	64,054	64,052	64,050	63,810	63,525	63,456	63,431	63,431	63,992	63,461	63,284
Diluted (in shares)	64,054	65,036	64,859	64,524	64,244	64,667	64,393	64,374	63,992	64,420	64,085
Earnings per share from continuing operations
Basic (in dollars per share)	$ (0.67)	$ 0.12	$ 0.11	$ 0.13	$ 0.19	$ 0.18	$ 0.18	$ 0.11	$ (0.31)	$ 0.66	$ 0.38
Diluted (in dollars per share)	$ (0.67)	$ 0.12	$ 0.11	$ 0.13	$ 0.19	$ 0.18	$ 0.17	$ 0.10	$ (0.31)	$ 0.65	$ 0.37