Disposition, Deconsolidation and Discontinued Operations (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended			6 Months Ended		12 Months Ended
	Apr. 01, 2015	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2005	Dec. 31, 2014	Mar. 31, 2014	Feb. 03, 2014	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2009	Jul. 14, 2005
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures									$ 7,700
Equity Method Investment, Ownership Percentage									28.70%
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal		$ 0		$ 0	$ 0	$ (1,242)
Stock Issued During Period, Shares, New Issues				2,875,000
Share Price				$ 0		$ 0				$ 25.000
Business Acquisition, Percentage of Voting Interests Acquired				15.70%		15.70%		16.90%
Proceeds from Issuance Initial Public Offering							$ 78,000
Preferred Units, Issued														3,120,000
Debt Instrument, Interest Rate, Stated Percentage														5.00%
Proceeds from Issuance of Long-term Debt and Capital Securities, Net							$ 74,100
LROC preferred units			2,333,715								1,500,000		833,715
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions			74.80%
LROC preferred units, at fair value		0	$ 15,800		0			$ 13,618
LROC Preferred Units Tendered												1,525,150
Cash Provided by (Used in) Operating Activities, Discontinued Operations					0	$ (600)
Loss on deconsolidation of subsidiary		(4,420)		$ 0	(4,420)	0
Deconsolidation, Gain (Loss), Amount		2,800
Proceeds from Divestiture of Interest in Subsidiaries and Affiliates	$ 47,000				44,919	$ 0
Disposal Group, Including Discontinued Operation, Consideration		2,000			$ 2,000
Premiums, Percentage Assumed to Net					0.00%
Common Stock [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity Method Investments, Fair Value Disclosure		$ 8,761			$ 8,761