Share Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Share Based Compensation

Summary of restricted stock units, performance-based stock units, and weighted average grant date fair values

	Employee Service-Based			Employee Performance-
	Awards			Based Awards			Director Awards
		Weighted			Weighted			Weighted
		Average			Average			Average
		Grant Date			Grant Date			Grant Date
	Units	Fair Value		Units	Fair Value		Units	Fair Value
Nonvested at December 31, 2017	1,183,039	$	14.30	702,391	$	19.40	98,406	$	12.66
Granted	569,571		15.70	165,853		15.76	61,376		18.25
Vested	(422,884)		16.07	(199,395)		22.16	(98,406)		12.66
Forfeited	(121,098)		13.02	(75,750)		18.06	—		—
Nonvested at December 31, 2018	1,208,628		14.47	593,099		17.63	61,376		18.25
Granted	467,896		19.14	147,983		19.16	55,752		20.09
Vested	(452,306)		14.48	(120,953)		18.40	(61,376)		18.25
Forfeited	(59,994)		14.94	(20,645)		18.32	—		—
Nonvested at December 31, 2019	1,164,224	$	16.32	599,484	$	17.82	55,752	$	20.10

Summary of option activity and weighted average exercise prices

						Weighted Average
						Remaining
		Weighted Average		Aggregate		Contractual Term
	Shares	Exercise Price		Intrinsic Value		(Years)
Outstanding at December 31, 2017	798,020	$	12.77	$	2,378,100
Granted	—		—
Terminated	(111,203)		12.77
Exercised	(4,948)		12.77
Outstanding at December 31, 2018	681,869		12.77		4,213,950		8.4
Granted	—		—
Terminated	(9,913)		12.77
Exercised	(148,851)		12.77
Outstanding at December 31, 2019	523,105	$	12.77	$	7,762,878		7.4