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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS Statement (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Statement of Comprehensive Income [Abstract]    
Net loss $ (47,041)us-gaap_NetIncomeLoss $ (79,173)us-gaap_NetIncomeLoss
Other comprehensive loss:    
Other post-retirement benefits and total other comprehensive loss (446)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 0us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive loss $ (47,487)us-gaap_ComprehensiveIncomeNetOfTax $ (79,173)us-gaap_ComprehensiveIncomeNetOfTax