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Notes Payable (Liability and Equity Components of Convertible Senior Notes) (Details) (USD $) In Thousands, unless otherwise specified		9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Oct. 24, 2013	Sep. 30, 2013 September 2015 Notes [Member]	Dec. 31, 2012 September 2015 Notes [Member]	Sep. 30, 2013 December 2029 Notes [Member]	Dec. 31, 2012 December 2029 Notes [Member]	Dec. 31, 2012 December 2024 Notes [Member]
Debt Instrument [Line Items]
Principal amount of liability component	$ 213,900	$ 200,000	$ 200,000	$ 115,839	$ 115,839	$ 28,243
Unamortized discount		(16,420)	(21,944)	(7,967)	(12,269)	0
Net carrying amount of liability component		183,580	178,056	107,872	103,570	28,243
Additional paid-in capital: carrying amount of equity component				15,586	15,586	22,637
Amount by which the if-converted value exceeds principal		$ 54,179	$ 0	$ 138,958	$ 30,382	$ 0

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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- Definition

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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