Commitments and Contingencies (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Other expenses
Rent expense	$ 4,756,000	$ 4,691,000	$ 9,549,000	$ 9,268,000
Operating leases
Remainder of 2013	9,094,000		9,094,000
2014	18,237,000		18,237,000
2015	18,859,000		18,859,000
2016	18,758,000		18,758,000
2017	17,318,000		17,318,000
Thereafter	77,242,000		77,242,000
Total	159,508,000		159,508,000
Construction Contracts
Remainder of 2013	56,510,000		56,510,000
2014	1,953,000		1,953,000
Total	58,463,000		58,463,000
Other
Remainder of 2013	2,300,000		2,300,000
2014	1,533,000		1,533,000
2015	1,071,000		1,071,000
2016	564,000		564,000
2017	176,000		176,000
Thereafter	1,484,000		1,484,000
Total	7,128,000		7,128,000
Total
Remainder of 2013	70,538,000		70,538,000
2014	83,172,000		83,172,000
2015	21,536,000		21,536,000
2016	20,928,000		20,928,000
2017	90,494,000		90,494,000
Thereafter	78,726,000		78,726,000
Total	365,394,000		365,394,000
Contractual obligations
Remainder of 2013	750,000		750,000
2014	58,250,000		58,250,000
2017	73,000,000		73,000,000
Total	132,000,000		132,000,000
Credit Facility
Contractual obligations
Remainder of 2013	803,000		803,000
2014	1,606,000		1,606,000
2015	1,606,000		1,606,000
2016	1,606,000		1,606,000
2017	73,000,000		73,000,000
Total	78,621,000		78,621,000
Mortgages payable
Contractual obligations
Remainder of 2013	1,831,000		1,831,000
2014	59,843,000		59,843,000
Total	61,674,000		61,674,000
Principal payments	59,000,000		59,000,000
Estimated interest payments in 2013			1,100,000
Estimated interest payments in 2014			$ 1,600,000