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Equity Method Investments - Narrative (Details) - USD ($)		2 Months Ended	3 Months Ended		6 Months Ended
	Mar. 03, 2016	Mar. 03, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015	Feb. 10, 2014	Jan. 20, 2010
Schedule of Equity Method Investments [Line Items]
Equity method investments			$ 2,739,000		$ 2,739,000			$ 3,959,000
Earnings from equity method investments			10,155,000	$ 13,754,000	23,969,000	$ 19,331,000
Gain on sale of equity method investment			$ 0	$ 0	$ 0	$ 2,078,000
RMC6, LLC (RCM6) | Disposed of by Sale
Schedule of Equity Method Investments [Line Items]
Ownership interest, percent	24.95%	24.95%
Proceeds from sale of ownership interest, including proceeds to third party	$ 1,800,000
Tinuum Group, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest, percent			42.50%	42.50%	42.50%	42.50%
Temporary equity			$ 11,500,000		$ 11,500,000			18,300,000
Equity method investments			0	$ 0	0	$ 0	$ 0	$ 0	$ 2,043,000	$ 0
Earnings from equity method investments			$ 9,138,000	12,832,000	$ 22,313,000	18,275,000
Ownership interest multiplied by net income available to members, percent			42.50%		42.50%
RMC6, LLC (RCM6)
Schedule of Equity Method Investments [Line Items]
Ownership interest, percent	24.95%	24.95%						24.95%			24.95%
Earnings from equity method investments		$ (557,000)	$ 0	0	$ 0	(557,000)
Gain on sale of equity method investment					2,100,000
Tinuum Services, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest, percent												50.00%
Equity method investments			2,700,000		2,700,000			$ 4,000,000
Earnings from equity method investments			$ 1,017,000	$ 922,000	$ 1,656,000	$ 1,613,000
Percent of losses removed from net income, attributable to noncontrolling interest			100.00%		100.00%

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Equity Method Investment, Net Sales Proceeds, Including Proceeds Received By Third Parties

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
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Amount of gain (loss) on sale or disposal of an equity method investment.

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