Industry Segments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Corporate Overhead Footnote
General and administrative expense	$ 8,821	$ 10,195	$ 30,279	$ 30,470
Depreciation and amortization	394	582	1,475	1,742
Interest expense	4,969	4,112	14,110	12,354
Other general corporate (income) expense, net	1,683	665	2,963	1,859
Total	$ 15,867	$ 15,554	$ 48,827	$ 46,425