Industry Segments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Corporate Overhead Footnote
General and administrative expense	$ 11,394	$ 9,911
Depreciation and amortization	554	581
Interest expense	4,531	4,152
Other general corporate (income) expense, net	562	562
Total	$ 17,041	$ 15,206