Fair Value of Financial Instruments (Fair Value of Financial Instruments, Non-Recurring Basis Measurements) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Other current liabilities, equity method investment	$ 43,373	$ 66,527
Equity Method Investee [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Other current liabilities, equity method investment	1,400	32,400
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	$ 18,000	17,700
4.875% Senior Notes [Member] | Senior Notes [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Debt instrument, interest rate (percentage)	4.875%
4.875% Senior Notes [Member] | Senior Notes [Member] | Fair Value, Measurements, Non-Recurring [Member] | Level 1 [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Fair value measurements, valuation techniques	the estimated fair value of the Company’s 4.875% Senior Notes, based on quoted market prices in active markets, a Level 1 input
4.875% Senior Notes [Member] | Senior Notes [Member] | Fair Value, Measurements, Non-Recurring [Member] | Carrying Amount [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
4.875% Senior Notes	$ 400,000	400,000
4.875% Senior Notes [Member] | Senior Notes [Member] | Fair Value, Measurements, Non-Recurring [Member] | Fair Value [Member] | Level 1 [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
4.875% Senior Notes	$ 379,000	$ 375,000