Business Combinations (Table) (Details) ([AlbaFieldMember], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	May 31, 2012
[AlbaFieldMember]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price			$ 255,400
Purchase Price Adjustment For Estimated After Tax Cash Outflows From Acquired Asset And Interest Costs From Economic Date Of January 1 2011 To Closing			(25,823)
Business Acquisition, Cost of Acquired Entity, Cash Paid			229,577
Business Acquisition, Purchase Price Allocation [Abstract]
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment			186,801
Business Acquisition, Purchase Price Allocation, Goodwill Amount			50,878
Business Acquisition, Purchase Price Allocation, Current Assets			24,632
Business Acquisition, Purchase Price Allocation, Current Liabilities			(12,815)
Business Acquisition Purchase Price Allocation Deferred Tax Liabilities Noncurrent			(5,818)
Business Acquisition, Purchase Price Allocation, Other Noncurrent Liabilities			(14,101)
Business Acquisition, Pro Forma Information [Abstract]
Business Acquisition, Pro Forma Revenue	291,575	318,476
Business Acquisition, Pro Forma Net Income (Loss)	$ (95,245)	$ (131,881)
Business Acquisition Proforma Earnings Per Share Basic And Diluted	$ (2.24)	$ (3.67)