Fair Value of Assets and Liabilities (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value of Level 3 Derivatives	$ 0		$ 1,600,000
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers Between Level 1 and Level 2	0	$ 0
Accounting Standards Update 2015-07 | Other long-term investments | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	$ 500,000		$ 600,000