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Debt New Revolving Credit Agreement (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
New Revolving Credit Facility
Jun. 30, 2013
Minimum
New Revolving Credit Facility
Jun. 30, 2013
Maximum
New Revolving Credit Facility
Debt Instrument [Line Items]          
Weighted average interest rate for borrowings     2.64%    
Long-term Line of Credit, Noncurrent $ 0 $ 39,500      
Ratio of EBITDA to fixed charges, springing covenant     1.1    
Percentage of excess availability to calculated borrowing base       10.00% 12.50%
Excess Availability, upper bound, Springing Covenant         12,500
Excess Availability, lower bound, springing covenant       10,000  
Excess availability, revolving credit facility     $ 89,834