Earnings Per Share Reconciliation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net earnings (loss)
Net income (loss) from continuing operations	$ 6,049	$ (9,801)	$ 3,028	$ (27,240)
Net income (loss) from discontinued operations	223	(912)	(1,864)	(3,009)
NET INCOME (LOSS)	6,272	(10,713)	1,164	(30,249)
Interest on 1.6 percent convertible senior notes due 2018	370	0	0	0
Net income (loss) available to common stockholders	$ 6,642	$ (10,713)	$ 1,164	$ (30,249)
DENOMINATOR
Basic earnings per share-weighted-average shares	44,627,548	44,368,874	44,551,441	44,303,958
Effect of dilutive securities:
Share-based payments (in shares)	469,979	0	387,331	0
1.6 percent convertible senior notes due 2018 (in shares)	3,473,298	0	0	0
Diluted earnings per share-adjusted weighted-average shares and assumed conversions	48,570,825	44,368,874	44,938,772	44,303,958
Basic
Continuing operations (in dollars per share)	$ 0.14	$ (0.22)	$ 0.07	$ (0.61)
Discontinued operations (in dollars per share)	$ 0.00	$ (0.02)	$ (0.04)	$ (0.07)
Total (in dollars per share)	$ 0.14	$ (0.24)	$ 0.03	$ (0.68)
Diluted
Continuing operations (in dollars per share)	$ 0.14	$ (0.22)	$ 0.07	$ (0.61)
Discontinued operations (in dollars per share)	$ 0.00	$ (0.02)	$ (0.04)	$ (0.07)
Total (in dollars per share)	$ 0.14	$ (0.24)	$ 0.03	$ (0.68)
1.6 percent convertible senior notes due May 2018
Convertible senior notes
Interest rate stated percentage	1.60%		1.60%