Discontinued Operations Summary of Cash Proceeds from Sale of Discontinued Operations (Details) $ in Thousands	9 Months Ended		12 Months Ended	21 Months Ended
	Sep. 30, 2015 USD ($) mo	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2015 USD ($) mo	Jun. 30, 2014 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contract price					$ 335,000
Repayment of long-term borrowings under committed line of credit	$ 0	$ (46,000)
Transaction expenses withheld from proceeds			$ (5,400)
Total net proceeds related to sales transaction				$ 143,900
Escrow Receivable	$ 13,800			$ 13,800
Number of Months Receivable Held in Escrow | mo	15			15
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax				$ 70,200
Indemnification Agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Escrow Receivable	$ 16,800			$ 16,800
Escrow Percentage of Contract Price	5.00%			5.00%
Working Capital Escrow Adjustment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Escrow Receivable	$ 1,000			$ 1,000