Supplemental Statements of Cash Flows Disclosures Supplemental Statements of Cash Flows Disclosures (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Statements of Cash Flow Disclosures [Abstract]
Interest on long-term debt and borrowing under the revolving credit facility	$ 53,752	$ 50,189	$ 48,797
Income taxes paid (refund), net	244	5,031	(6,260)
Grants of restricted shares of common stock	3,224	2,411	3,268
Issuance of performance shares	849	1,193	628
Acquisition of treasury stock for options exercised	$ 0	$ 0	$ 500