Fair Value Measurements - Schedule of Certain Debt (Details) - Recurring basis - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair Value Measurements
Carrying value of debt	$ 846,611	$ 947,897
Fair value of debt	851,993	956,811
Level 2
Fair Value Measurements
Fair value of debt	4,272	69,766
Level 3
Fair Value Measurements
Fair value of debt	$ 847,721	$ 887,045

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611

Name:	us-gaap_DebtInstrumentFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant