Industry Segments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Corporate Overhead Footnote
General and administrative expense	$ 9,246	$ 8,282	$ 19,158	$ 18,650
Depreciation and amortization	864	729	1,733	1,414
Interest expense	4,045	4,140	8,236	8,494
Other general corporate (income) expense, net	317	14,325	1,131	14,559
Total	$ 14,472	$ 27,476	$ 30,258	$ 43,117