Supplemental Financial Information (Property and Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 317,975	$ 273,857
Accumulated depreciation and amortization	(122,870)	(106,243)
Property and equipment, net	195,105	167,614
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	199,261	169,953
Furniture, Fixtures, and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	108,882	92,695
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 9,832	$ 11,209