Stock-Based Compensation (Restricted Shares) (Details) - USD ($)		3 Months Ended		9 Months Ended
	Apr. 01, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period				3,680	3,200
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition				1 year 9 months 18 days
Share-based Payment Arrangement, Expense		$ 685,000	$ 1,000,000	$ 3,273,000	$ 3,340,000
Weighted - Average Grant Date Fair Value (in dollars per share)
Maximum Aggregate Value of Performance Unit Award Outstanding		1,300,000		$ 1,300,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period				9,395
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense		$ 0	46,000	$ (12,000)	96,000
Weighted - Average Grant Date Fair Value (in dollars per share)
Shares Issued, Price Per Share		$ 29.26		$ 29.26
Restricted Shares
Weighted - Average Grant Date Fair Value (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested				$ 2,000,000.0	1,800,000
Restricted Shares | Maximum | Employees
Weighted - Average Grant Date Fair Value (in dollars per share)
Awards expiration period				5 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense		$ 615,000	$ 888,000	$ 2,950,000	2,944,000
Time-Based Vesting | Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period				20,864
Number of Shares (in shares)
Outstanding at January 1				32,230
Released				5,250
Forfeited				7,286
44104		40,558		40,558
Weighted - Average Grant Date Fair Value (in dollars per share)
Outstanding at January 1				$ 33.05
Awarded				20.21
Released				32.76
Forfeited				31.85
44104		$ 26.70		$ 26.70
Performance-Based Vesting | Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period				80,338
Number of Shares (in shares)
Outstanding at January 1				253,884
Awarded				80,338
Released				56,827
Forfeited				6,159
44104		271,236		271,236
Weighted - Average Grant Date Fair Value (in dollars per share)
Outstanding at January 1				$ 33.29
Awarded				32.91
Released				32.42
Forfeited				33.09
44104		$ 33.36		$ 33.36
Treasury Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	$ 396,000
Treasury Stock | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture				$ 275,000
Treasury Stock | Director [Member]
Weighted - Average Grant Date Fair Value (in dollars per share)
Shares Issued, Value, Share-based Payment Arrangement, Forfeited				120,000	102,000
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense				$ 47,000	$ 48,000