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Senior Notes and Subsidiary Guarantee (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
7.75% Senior Notes [Member]
Debt Instrument [Line Items]
Senior Notes, amount outstanding	$ 285.0
Debt instrument, interest rate	7.75%
7.375% Senior Notes [Member]
Debt Instrument [Line Items]
Senior Notes, amount outstanding	$ 255.0
Debt instrument, interest rate	7.375%

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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