Earnings Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reconciliation of Diluted Shares
Denominator for Basic Earnings Per Share (in shares)	42,251,541	42,543,122	42,336,441	42,730,571
Dilutive Effect of Equity Based Awards (in shares)	313,823	235,224	325,722	216,488
Denominator for Diluted Earnings Per Share (in shares)	42,565,364	42,778,346	42,662,163	42,947,059
Antidilutive Stock Options and Restricted Stock Outstanding (in shares)	1,070	0	363	0