Equity and Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Jan. 01, 2018
Beginning Balance	$ 436,369	$ 409,618
Cumulative effect of accounting change			$ (44)	$ (754)
Adjusted beginning balance			436,325	408,864
Net Income	13,900	12,787
Amounts reported in other comprehensive income (loss)	1,547	6,457
Dividends, Common Stock	(4,933)	(4,729)
Distributions to Noncontrolling Affiliate Shareholders	0	(834)
Share Issuance and Equity-Based Compensation Plans	(476)	218
Ending Balance	446,363	422,763
Common Stock [Member]
Beginning Balance	13,338	13,308
Cumulative effect of accounting change			0	0
Adjusted beginning balance			13,338	13,308
Net Income	0	0
Amounts reported in other comprehensive income (loss)	0	0
Dividends, Common Stock	0	0
Distributions to Noncontrolling Affiliate Shareholders	0	0
Share Issuance and Equity-Based Compensation Plans	(4)	15
Ending Balance	13,334	13,323
Additional Paid-in Capital [Member]
Beginning Balance	97,304	93,528
Cumulative effect of accounting change			0	0
Adjusted beginning balance			97,304	93,528
Net Income	0	0
Amounts reported in other comprehensive income (loss)	0	0
Dividends, Common Stock	0	0
Distributions to Noncontrolling Affiliate Shareholders	0	0
Share Issuance and Equity-Based Compensation Plans	(472)	203
Ending Balance	96,832	93,731
Retained Earnings [Member]
Beginning Balance	405,125	365,936
Cumulative effect of accounting change			(44)	(754)
Adjusted beginning balance			405,081	365,182
Net Income	13,844	12,732
Amounts reported in other comprehensive income (loss)	0	0
Dividends, Common Stock	(4,933)	(4,729)
Distributions to Noncontrolling Affiliate Shareholders	0	0
Share Issuance and Equity-Based Compensation Plans	0	0
Ending Balance	413,992	373,185
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance	(80,715)	(65,100)
Cumulative effect of accounting change			0	0
Adjusted beginning balance			(80,715)	(65,100)
Net Income	0	0
Amounts reported in other comprehensive income (loss)	1,548	6,362
Dividends, Common Stock	0	0
Distributions to Noncontrolling Affiliate Shareholders	0	0
Share Issuance and Equity-Based Compensation Plans	0	0
Ending Balance	(79,167)	(58,738)
Noncontrolling Interest [Member]
Beginning Balance	1,317	1,946
Cumulative effect of accounting change			0	0
Adjusted beginning balance			$ 1,317	$ 1,946
Net Income	56	55
Amounts reported in other comprehensive income (loss)	(1)	95
Dividends, Common Stock	0	0
Distributions to Noncontrolling Affiliate Shareholders	0	(834)
Share Issuance and Equity-Based Compensation Plans	0	0
Ending Balance	$ 1,372	$ 1,262