Stock-Based Compensation (Restricted Stock and Performance Unit Awards) (Details)	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested Shares, Beginning Balance, Weighted Average Grant Date Fair Value | $ / shares	$ 36.25
Granted, Weighted Average Grant Date Fair Value | $ / shares	47.88
Vested, Weighted Average Grant Date Fair Value | $ / shares	31.66
Adjustment for incentive awards expected to vest, Weighted Average Grant Date Fair Value | $ / shares	43.97
Canceled, Weighted Average Grant Date Fair Value | $ / shares	38.44
Nonvested Shares, Ending Balance, Weighted Average Grant Date Fair Value | $ / shares	$ 41.32
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested Shares, Outstanding, Beginning Balance	108,237
Granted	29,656
Vested	(34,839)
Adjustment for incentive awards expected to vest	0
Canceled	(1,000)
Nonvested Shares, Outstanding, Ending Balance	102,054
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested Shares, Outstanding, Beginning Balance	71,990
Granted	41,114
Vested	(23,877)
Adjustment for incentive awards expected to vest	(45,384)
Canceled	0
Nonvested Shares, Outstanding, Ending Balance	43,843