Industry Segments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Corporate Overhead Footnote
General and administrative expense	$ 9,911	$ 9,912
Depreciation and amortization	581	869
Interest expense	4,152	4,191
Other general corporate (income) expense, net	562	814
Total	$ 15,206	$ 15,786