Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Cash Flow Information [Abstract]
Interest paid	$ 477,395	$ 504,494	$ 404,443
Income taxes paid (refund)	15,591	3,375	4,340
Assets acquired through capital leases and installment sales	56,279	58,638	27,094
Conversion of redeemable convertible preferred stock	0	305,180	0
Assumption of WCP Securitized Notes	$ 0	$ 336,273	$ 0