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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 |

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