Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Thousands, shares in Millions		6 Months Ended
	May. 24, 2015	Jun. 30, 2015	Mar. 31, 2015
Investments in Unconsolidated Affiliates
Cash consideration in merger		$ 660,050
Estimated gross gain in merger		102,200
Transaction costs related to the merger		$ 49,600
CJES
Investments in Unconsolidated Affiliates
Cash consideration in merger	$ 693,500
Common shares held in merged entity	62.5
Percentage of outstanding and issued common shares held	53.00%
Fair value of shares received	$ 676,200		$ 696,100
Carrying value of equity method investment			$ 675,300
Estimated gross gain in merger	102,200
Transaction costs related to the merger	$ 49,600