Schedule II (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]
Allowance for doubtful accounts, beginning balance	$ 1,905	$ 2,551	$ 3,411
Additions to allowance for doubtful accounts	2,565	2,613	1,467
Deductions to allowance for doubtful accounts	(2,998)	(3,259)	(2,327)
Allowance for doubtful accounts, ending balance	1,472	1,905	2,551
Allowance for Doubtful Accounts - Straight Line Rent [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Allowance for doubtful accounts, beginning balance	316	601	381
Additions to allowance for doubtful accounts	1,412	1,271	496
Deductions to allowance for doubtful accounts	(1,471)	(1,556)	(276)
Allowance for doubtful accounts, ending balance	257	316	601
Allowance for Doubtful Accounts - Accounts Receivable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Allowance for doubtful accounts, beginning balance	1,314	1,648	2,848
Additions to allowance for doubtful accounts	1,141	1,342	851
Deductions to allowance for doubtful accounts	(1,527)	(1,676)	(2,051)
Allowance for doubtful accounts, ending balance	928	1,314	1,648
Allowance for Doubtful Accounts - Notes Receivable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Allowance for doubtful accounts, beginning balance	275	302	182
Additions to allowance for doubtful accounts	12	0	120
Deductions to allowance for doubtful accounts	0	(27)	0
Allowance for doubtful accounts, ending balance	$ 287	$ 275	$ 302

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 09
-Article 12

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- Definition

Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

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