Schedule of Notes Payable (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Notes Payable [Line Items]
Notes Payable	$ 374,433	$ 300,000
Long-term Debt, Gross	375,000	300,000
Long-term Debt	374,433	300,000
Notes Payable to Banks [Member]
Notes Payable [Line Items]
Notes Payable	0	300,000
Debt Instrument, Unamortized Discount		0
Debt Instrument, Interest Rate, Stated Percentage	0.00%	5.50%
Senior Notes [Member]
Notes Payable [Line Items]
Notes Payable	375,000	0
Debt Instrument, Unamortized Discount	$ (567)
Debt Instrument, Interest Rate, Stated Percentage	4.75%	0.00%

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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