Quarterly Results of Operations (Results of Operations) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 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	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Results of Operations [Abstract]
Revenue, Net	$ 124,176	$ 129,134	$ 125,296	$ 120,155	$ 125,251	$ 146,295	$ 142,167	$ 134,628	$ 498,761	$ 548,341	$ 373,230
Gross Profit	42,711	42,977	36,654	36,404	37,174	50,906	48,452	42,453	158,746	178,985	136,949
Income (loss) from continuing operations, net of tax	$ 5,179	$ 59,124	$ 6,417	$ (1,586)	$ 3,740	$ 15,904	$ 13,488	$ 11,118	$ 69,134	$ 44,250	$ 38,551
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.31	$ 3.60	$ 0.40	$ (0.10)	$ 0.23	$ 0.98	$ 0.85	$ 0.70	$ 4.21	$ 2.76	$ 2.44
Income (loss) from discontinued operations	$ 0.30	$ 3.48	$ 0.39	$ (0.10)	$ 0.22	$ 0.94	$ 0.81	$ 0.67	$ (0.03)	$ (0.45)	$ (0.25)