Employee Benefit Plans and Shareholder Rights Plan (Tables)

12 Months Ended

Dec. 31, 2014

Employee Benefit Plans and Shareholder Rights Plan [Abstract]

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity

The following is a summary of our restricted stock and restricted stock unit activity for 2014, 2013 and 2012:

	Number		Weighted Average Fair Value		Aggregate Intrinsic Value
Balance at December 31, 2011	1,090,850		30.49
Granted	337,575		55.98
Issued	(369,050	)	20.03		$	20,325,000
Forfeited	(27,803	)	42.02
Balance at December 31, 2012	1,031,572		42.27
Granted	330,705		62.55
Issued	(376,078	)	33.18		$	23,904,000
Forfeited	(25,909	)	52.72
Balance at December 31, 2013	960,290		52.53
Granted	299,274		70.63
Issued	(411,800	)	43.57		$	29,043,000
Forfeited	(33,364	)	62.66
Balance at December 31, 2014	814,400		$	63.30