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Long-Term Obligations and Short-Term Note Payable Long Term Obligations (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Long Term Obligations [Abstract]  
Long-term Debt, Maturities, Repayments of Principal in Year Four $ 0
Long-term Debt, Maturities, Repayments of Principal in Year Five 90,000,000
Line of Credit Facility, Maximum Borrowing Capacity 175,000,000
Letter of Credit sub-limit 50,000,000
Swing line sub-limit 7,000,000
Maximum Borrowing Capacity under Accordion Feature 225,000,000
Limiited guaranty of debt of subsidiary 102,000,000
Debt Instrument, Maturity Date Nov. 07, 2017
Debt, Weighted Average Interest Rate 2.30%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.30%
Debt and Capital Lease Obligations 90,000,000
Letters of Credit Outstanding, Amount 10,000,000
Line of Credit Facility, Amount Outstanding $ 75,000,000