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Fair Value Measurements (Details 2) (USD $)	Mar. 31, 2013	Mar. 31, 2013 2012 notes - 7.625%	Dec. 31, 2012 2012 notes - 7.625%	Aug. 07, 2012 2012 notes - 7.625%	Mar. 31, 2013 Add-on notes - 7.625%	Feb. 12, 2013 Add-on notes - 7.625%	Dec. 31, 2012 Floating Rate Notes
Fair Value of Other Financial Instruments
Carrying Value		$ 425,000,000	$ 425,000,000		$ 233,800,000		$ 230,000,000
Fair Value		457,400,000	448,400,000		236,500,000		229,100,000
Interest rate (as a percent)		7.625%	7.625%	7.625%	7.625%	7.625%
Unamortized bond premium	$ 13,828,000				$ 13,800,000

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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