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Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Long-Term Debt |  |  |
Interest incurred | $ 2,936 | $ 4,146 | $ 3,170
Capitalized interest | 1,026 | 627 | 554
Interest paid (net of capitalized interest) | $ 1,498 | $ 3,168 | $ 1,899
Weighted average interest rate | 2.30% | 2.80% | 3.00%

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