Schedule II (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Movement in Valuation Allowances and Reserves [Roll Forward]
Allowance for doubtful accounts, beginning balance	$ 3,843	$ 4,903	$ 6,672
Additions to allowance for doubtful accounts	1,516	2,335	2,522
Deductions to allowance for doubtful accounts	(2,346)	(3,395)	(4,291)
Allowance for doubtful accounts, ending balance	3,013	3,843	4,903
Allowance for Doubtful Accounts - Straight Line Rent [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Allowance for doubtful accounts, beginning balance	813	1,294	2,209
Additions to allowance for doubtful accounts	545	1,382	710
Deductions to allowance for doubtful accounts	(295)	(1,863)	(1,625)
Allowance for doubtful accounts, ending balance	1,063	813	1,294
Allowance for Doubtful Accounts - Accounts Receivable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Allowance for doubtful accounts, beginning balance	2,848	3,548	3,595
Additions to allowance for doubtful accounts	851	767	1,616
Deductions to allowance for doubtful accounts	(2,051)	(1,467)	(1,663)
Allowance for doubtful accounts, ending balance	1,648	2,848	3,548
Allowance for Doubtful Accounts - Notes Receivable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Allowance for doubtful accounts, beginning balance	182	61	868
Additions to allowance for doubtful accounts	120	186	196
Deductions to allowance for doubtful accounts	0	(65)	(1,003)
Allowance for doubtful accounts, ending balance	$ 302	$ 182	$ 61