Earnings Per Share (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Basic computation	43,451,000	39,141,000	39,137,000	38,856,000	38,626,000	38,459,000	38,092,000	37,384,000	40,156,177		38,144,852	36,847,427
Restricted stock and performance share awards (1)									275,774	[1]	82,223
Diluted computation									40,431,951		38,227,075

[1] Performance share awards are included in diluted weighted average number of shares outstanding based upon what would be issued if the end of the most recent reporting period was the end of the term of the award.