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Fair Value Measurements - Table 1 (Details) (USD $)	3 Months Ended	12 Months Ended
Fair Value Measurements - Table 1 (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Fair Value Measurements, Valuation Techniques	I	I
Redeemable Noncontrolling Interest, Fair Value	$ 84,700,000	$ 84,700,000
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Redeemable Noncontrolling Interest, Fair Value	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Redeemable Noncontrolling Interest, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Redeemable Noncontrolling Interest, Fair Value	84,700,000	84,700,000
Other Current Assets [Member] \| Restricted Marketable Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Restricted Marketable Securities, Fair Value	900,000	4,600,000
Fair Value Measurements, Valuation Techniques	M	M
Other Current Assets [Member] \| Restricted Marketable Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Restricted Marketable Securities, Fair Value	0	0
Other Current Assets [Member] \| Restricted Marketable Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Restricted Marketable Securities, Fair Value	900,000	4,600,000
Other Current Assets [Member] \| Restricted Marketable Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Restricted Marketable Securities, Fair Value	0	0
Other Long-term Assets [Member] \| Restricted Marketable Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Restricted Marketable Securities, Fair Value	50,200,000	45,900,000
Fair Value Measurements, Valuation Techniques	M	M
Other Long-term Assets [Member] \| Restricted Marketable Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Restricted Marketable Securities, Fair Value	0	0
Other Long-term Assets [Member] \| Restricted Marketable Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Restricted Marketable Securities, Fair Value	50,200,000	45,900,000
Other Long-term Assets [Member] \| Restricted Marketable Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Restricted Marketable Securities, Fair Value	$ 0	$ 0

The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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