Benefit Plans (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) shares
Defined Benefit Plan Disclosure [Line Items]
Unrecognized compensation cost | $	$ 12.9
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized compensation cost recognized over a weighted average period	1 year
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized compensation cost recognized over a weighted average period	2 years
Restricted Stock Units [Member]
Defined Benefit Plan Disclosure [Line Items]
Performance period	3 years
Instrument valuation based on shares of common stock, number of shares	1
Actual number of shares paid out upon vesting, minimum percentage of target shares	0.00%
Actual number of shares paid out upon vesting, maximum percentage of target shares	200.00%
Performance Units [Member]
Defined Benefit Plan Disclosure [Line Items]
Instrument valuation based on shares of common stock, number of shares	1
Performance Restricted Stock Unit [Member]
Defined Benefit Plan Disclosure [Line Items]
Instrument valuation based on shares of common stock, number of shares	1
Performance Restricted Unit [Member]
Defined Benefit Plan Disclosure [Line Items]
Instrument valuation based on shares of common stock, number of shares	1
Key Employee Performance Restricted Unit [Member]
Defined Benefit Plan Disclosure [Line Items]
Instrument valuation based on shares of common stock, number of shares	1