Industry Segments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Corporate Overhead Footnote
General and administrative expense	$ 10,195	$ 10,442	$ 30,470	$ 29,600
Depreciation and amortization	582	855	1,742	2,588
Interest expense	4,112	4,155	12,354	12,391
Other general corporate (income) expense, net	665	279	1,859	1,410
Total	$ 15,554	$ 15,731	$ 46,425	$ 45,989