Commitments Capital Lease Financing Obligations (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2013
Capital Leases, Future Minimum Payments Due [Abstract]
2014	$ 19,957,000
2015	18,346,000
2016	11,809,000
2017	10,714,000
2018	10,612,000
Thereafter	2,121,000
Total payments	73,559,000
Less: amount representing interest	(7,912,000)
Present value of payments	65,647,000
Letter of credit, amount outstanding				31,900,000
Term of letter of credit	1 year
Decrease in restricted cash	$ (31,804,000)	$ (2,156,000)	$ 0