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Credit Arrangements (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Credit arrangements    
Total long-term debt $ 147,813 $ 69,722
Less: current portion (19,446) (13,870)
Long-term debt, net of current portion 128,367 55,852
Scheduled maturities of long-term debt    
2013 19,446  
2014 20,002  
2015 18,605  
2016 25,116  
2017 15,286  
Thereafter 49,358  
Total long-term debt 147,813 69,722
Commercial notes, due December 23, 2016
    
Credit arrangements    
Total long-term debt 18,988 26,243
Monthly payment of principal and interest 518 518
Scheduled maturities of long-term debt    
Total long-term debt 18,988 26,243
Commercial notes, due December 23, 2016 | Minimum
    
Credit arrangements    
Interest rate (as a percent) 2.16% 2.16%
Commercial notes, due December 23, 2016 | Maximum
    
Credit arrangements    
Interest rate (as a percent) 4.12% 4.12%
Commercial notes, maturing on July 1, 2017
    
Credit arrangements    
Total long-term debt 6,800 8,125
Interest rate (as a percent) 4.71% 4.71%
Monthly payment of principal and interest 140 140
Scheduled maturities of long-term debt    
Total long-term debt 6,800 8,125
Construction equipment note, maturing on December 31, 2017
    
Credit arrangements    
Total long-term debt 5,550 6,543
Interest rate (as a percent) 3.67% 3.67%
Monthly payment of principal and interest 101 101
Scheduled maturities of long-term debt    
Total long-term debt 5,550 6,543
Commercial notes, due June 15, 2017
    
Credit arrangements    
Total long-term debt 10,441 12,811
Monthly payment of principal and interest 226 226
Scheduled maturities of long-term debt    
Total long-term debt 10,441 12,811
Commercial notes, due June 15, 2017 | Minimum
    
Credit arrangements    
Interest rate (as a percent) 2.63% 2.63%
Commercial notes, due June 15, 2017 | Maximum
    
Credit arrangements    
Interest rate (as a percent) 3.50% 3.50%
Construction equipment note, maturing on November 30, 2016
    
Credit arrangements    
Total long-term debt 12,935 16,000
Interest rate (as a percent) 2.14% 2.14%
Monthly payment of principal and interest 281 281
Scheduled maturities of long-term debt    
Total long-term debt 12,935 16,000
Construction equipment note, maturing on November 1, 2019
    
Credit arrangements    
Total long-term debt 21,713  
Monthly payment of principal and interest 294  
Scheduled maturities of long-term debt    
Total long-term debt 21,713  
Construction equipment note, maturing on November 1, 2019 | Minimum
    
Credit arrangements    
Interest rate (as a percent) 2.23%  
Construction equipment note, maturing on November 1, 2019 | Maximum
    
Credit arrangements    
Interest rate (as a percent) 2.44%  
Commercial notes, maturing on December 21, 2019
    
Credit arrangements    
Total long-term debt 17,800  
Monthly payment of principal and interest 193  
Scheduled maturities of long-term debt    
Total long-term debt 17,800  
Commercial notes, maturing on December 21, 2019 | Minimum
    
Credit arrangements    
Interest rate (as a percent) 2.05%  
Commercial notes, maturing on December 21, 2019 | Maximum
    
Credit arrangements    
Interest rate (as a percent) 3.51%  
Construction equipment note, maturing on August 13, 2017
    
Credit arrangements    
Total long-term debt 3,586  
Interest rate (as a percent) 2.06%  
Monthly payment of principal and interest 68  
Scheduled maturities of long-term debt    
Total long-term debt 3,586  
Senior secured notes, maturing on December 28, 2022
    
Credit arrangements    
Total long-term debt 50,000  
Interest rate (as a percent) 3.65%  
Scheduled maturities of long-term debt    
Total long-term debt $ 50,000