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Fair Value Measurements (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Recurring
Level 1
Dec. 31, 2012
Recurring
Level 1
Mar. 31, 2013
Recurring
Level 2
Dec. 31, 2012
Recurring
Level 2
Mar. 31, 2013
Recurring
Level 2
Other derivative agreements
Dec. 31, 2012
Recurring
Level 2
Other derivative agreements
Mar. 31, 2013
Recurring
Level 2
Interest rate swap
Dec. 31, 2012
Recurring
Level 2
Interest rate swap
Mar. 31, 2013
Recurring
Total
Dec. 31, 2012
Recurring
Total
Mar. 31, 2013
Recurring
Total
Other derivative agreements
Dec. 31, 2012
Recurring
Total
Other derivative agreements
Mar. 31, 2013
Recurring
Total
Interest rate swap
Dec. 31, 2012
Recurring
Total
Interest rate swap
Fair value measurements                              
Cash equivalents   $ 133,929,000 $ 133,897,000             $ 133,929,000 $ 133,897,000        
Other current assets (marketable securities)   50,000 38,000             50,000 38,000        
Other long-term assets (other derivative agreements)           1,461,000 938,000         1,461,000 938,000    
Total Assets   133,979,000 133,935,000 1,461,000 938,000         135,440,000 134,873,000        
Other current liabilities       (35,781,000) (1,072,000)   (67,747,000) (840,000) (861,000) (35,781,000) (1,072,000)   (67,747,000) (840,000) (861,000)
Other current liabilities       (31,960,000)           (31,960,000)          
Other long-term liabilities               (1,699,000) (1,890,000)         (1,699,000) (1,890,000)
Total Liabilities       (70,280,000) (71,570,000)         (70,280,000) (71,570,000)        
Transfers of assets or liabilities between levels $ 0