Basis of Presentation and Summary of Significant Accounting Policies - Fair Value of Financial Instruments (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, less current maturities	$ 1,203,517,000	$ 1,202,063,000
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, less current maturities at fair value	$ 1,306,200,000	$ 1,334,200,000