Share-Based Payment Arrangements (Tables)

12 Months Ended

Dec. 31, 2018

Share-Based Payment Arrangements [Abstract]

Summary of Option Activity

Options	Number of Shares	Weighted- Average Exercise Price ($)		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value ($000)
Outstanding at January 1, 2018	88,301	$	34.84	2.8	$	1,294
Exercised	(35,317)		37.39			592
Expired	(6,119)		42.82			10
Outstanding at December 31, 2018	46,865	$	31.88	2.6	$	164
Exercisable at December 31, 2018	46,685	$	31.88	2.6	$	164

Summary of Nonvested Restricted and Performance Shares

	Number of Shares	Weighted- Average Grant-Date Fair Value ($)
Nonvested at January 1, 2018	1,708,942	$	37.05
Granted	647,376		39.70
Vested	(792,084)		33.94
Cancelled/Forfeited	(70,193)		36.13
Nonvested at December 31, 2018	1,494,041	$	39.89