Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reconciliation of Diluted Shares
Denominator for Basic Earnings Per Share (in shares)	42,353,976	42,729,731	42,379,730	42,825,369
Dilutive Effect of Equity Based Awards (in shares)	304,909	213,229	324,280	207,830
Denominator for Diluted Earnings Per Share (in shares)	42,658,885	42,942,960	42,704,010	43,033,199
Antidilutive Stock Options and Restricted Stock Outstanding (in shares)	7,127	0	0	1,438