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Commitments and Contingencies - Contractual Obligations (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Capital Lease Obligations                  
2013 $ 4,001                
2014 3,692                
2015 3,376                
2016 1,469                
2017 797                
Thereafter 93                
Total minimum lease payments 13,428                
Less: imputed interest (3.5% to 10.7%) (1,260)                
Present value of future minimum lease payments 12,168                
Less: current portion 3,409 3,435 3,527 3,683 3,737 2,745 1,674 1,588 1,570
Long-term capital lease obligation 8,759 9,552 10,617 11,368 12,130 9,759 6,254 6,664 7,066
Operating Lease Obligations [Abstract]                  
2013 3,868                
2014 3,130                
2015 2,151                
2016 1,398                
2017 1,214                
Thereafter 833                
Future Minimum Payments Due 12,594                
Purchase Commitments                  
2014 18,583                
2015 0                
2016 0                
2017 0                
2018 0                
Thereafter 0                
Future minimum purchase commitments 18,583                
Pension Plan
                 
Defined Benefit Plan Obligations                  
2013 6,641                
2014 6,794                
2015 6,951                
2016 7,228                
2017 7,477                
Thereafter 42,443                
Future payments due 77,534                
Postretirement Benefits Other Than Pension
                 
Defined Benefit Plan Obligations                  
2013 640                
2014 762                
2015 836                
2016 913                
2017 1,034                
Thereafter 6,522                
Future payments due 10,707                
Minimum
                 
Capital Lease Obligations                  
Imputed interest rate on capital leases 0.82%                
Maximum
                 
Capital Lease Obligations                  
Imputed interest rate on capital leases 10.70%                
Revolving Credit Facility
                 
Revolving Credit Facility                  
2014 9,654                
2015 10,000                
2016 0                
2017 0                
2018 0                
Thereafter 0                
Future minimum debt maturities $ 19,654