Employee Benefit Plans and Shareholder Rights Plan (Tables)

12 Months Ended

Dec. 31, 2018

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 2018, 2017 and 2016:

	Number		Weighted Average Fair Value	Aggregate Intrinsic Value
Balance at December 31, 2015	831,291		60.49
Granted	587,953		27.90
Issued	(278,572	)	61.48	$	7,866,000
Forfeited	(88,665	)	43.03
Balance at December 31, 2016	1,052,007		43.48
Granted	489,514		26.70
Issued	(277,968	)	61.90	$	7,038,000
Forfeited	(81,748	)	34.15
Balance at December 31, 2017	1,181,805		32.84
Granted	653,286		18.05
Issued	(320,147	)	47.62	$	5,993,000
Forfeited	(71,047	)	24.87
Balance at December 31, 2018	1,443,897		23.27