Industry Segments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Corporate Overhead Footnote
General and administrative expense	$ 10,364	$ 9,246	$ 20,275	$ 19,158
Depreciation and amortization	579	864	1,160	1,733
Interest expense	4,090	4,045	8,242	8,236
Other general corporate (income) expense, net	632	317	1,194	1,131
Total	$ 15,665	$ 14,472	$ 30,871	$ 30,258