Leases (Details 3) - Operating Leases (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Future operating lease payments under non-cancelable leases
2014	$ 67,160,000
2015	69,306,000
2016	65,124,000
2017	64,944,000
2018	60,172,000
Thereafter	591,054,000
Total minimum operating lease payments	917,760,000
Rent expense
Rent expense	$ 66,000,000	$ 46,100,000	$ 34,100,000