Earnings per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Weighted average basic common shares outstanding	42,790	44,660	43,063	44,783
Performance shares (in shares)	104	111	86	105
Restricted stock (in shares)	65	139	65	157
Weighted average diluted common and potential common shares outstanding	42,959	44,910	43,214	45,045