Long-term Debt Long Term Debt (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Long-term debt	$ 1,624,712	$ 1,858,135
Current portion of long-term debt	84,366	87,569
Long-term debt, less current portion	1,540,346	1,770,566
Credit Agreement [Member]
Long-term debt	1,583,798	1,805,799
Debt instrument, maturity date	Oct. 01, 2017
Debt instrument, interest rate, stated percentage	2.13%	3.04%
TEUs - amortizing note [Member]
Long-term debt	21,878	32,435
Debt instrument, maturity date	Oct. 01, 2015
Coupon rate	5.00%	5.00%
Debt instrument, interest rate, stated percentage		4.50%
Other debt [Member]
Long-term debt	$ 19,036	$ 19,901
Debt instrument, maturity date	Oct. 01, 2054
Debt instrument, interest rate, stated percentage	10.00%	10.00%