Share-Based Payment Arrangements (Tables)

3 Months Ended

Mar. 31, 2018

Share-Based Payment Arrangements [Abstract]

Summary of Option Activity

				Weighted
				Average
		Weighted		Remaining
		Average		Contractual	Aggregate
	Number of	Exercise		Term	Intrinsic
Options	Shares	Price		(Years)	Value ($000)
Outstanding at January 1, 2018	88,301	$	34.84	2.8	$	1,294
Exercised/Released	(24,793)		35.12			495
Cancelled/Forfeited	—		—			—
Expired	—		—			—
Outstanding at March 31, 2018	63,508	$	34.73	2.6	$	1,078
Exercisable at March 31, 2018	63,508	$	34.73	2.6	$	1,078

Summary of Nonvested Restricted and Performance Shares

			Weighted
			Average
	Number of		Grant Date
	Shares		Fair Value
Nonvested at January 1, 2018	1,708,942	$	37.05
Granted	54,710		48.22
Vested	(9,587)		35.90
Forfeited	(30,376)		35.25
Nonvested at March 31, 2018	1,723,689	$	37.44