Earnings per Share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Weighted average basic common shares outstanding	44,110	42,517	43,265	42,879
Performance shares (in shares)	147	114	119	95
Restricted stock (in shares)	63	54	66	64
Weighted average diluted common and potential common shares outstanding	44,320	42,685	43,450	43,038