Fair Value of Financial Instruments (Fair Value of Financial Instruments, Non-Recurring Basis Measurements) (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Other current liabilities, equity method investment (in dollars)	$ 66,527	$ 17,665	$ 13,890	$ 20,431	$ 26,162
Equity Method Investment [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Other current liabilities, equity method investment (in dollars)	$ 32,400
Senior Notes [Member] | 4.875% Senior Notes [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Debt instrument, interest rate (percentage)	4.875%
Fair Value Measurements, Non-Recurring [Member] | Carrying Amount [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Cost and equity method investments, including long-term receivables from investees and joint ventures, aggregate carrying value (in dollars)	$ 17,700				$ 15,000
Fair Value Measurements, Non-Recurring [Member] | Level 1 [Member] | Senior Notes [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Fair value measurements, valuation techniques	The estimated fair values of the Company’s 4.875% Senior Notes, 2009 Convertible Notes and 2011 Convertible Notes are based on quoted market prices in active markets, a Level 1 input.