Leverage And Liquidity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Liquidity [Line Items]
Long term debt	$ 999,679		$ 999,679		$ 940,771
Net loss	62,463	$ 204,599	75,397	$ 233,844	349,300	$ 78,200	$ 151,100
Net cash provided by (used in) provided by operating activities			13,036	9,869
Unrestricted cash	62,082	$ 25,682	62,082	$ 25,682	$ 99,167	$ 17,462
Senior Secured Revolving Credit Facility [Member]
Liquidity [Line Items]
Available revolving credit facility	$ 122,000		$ 122,000