Equity and Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Beginning Balance	$ 412,606	$ 381,243
Net Income	7,614	13,344
Amounts reported in other comprehensive income (loss)	5,966	5,376
Repurchases of common stock	0	(5,859)
Dividends, Common Stock	(4,587)	(4,227)
Share Issuance and Equity-Based Compensation Plans	376	1,545
Excess Tax Benefit From Stock Option Exercises	0	104
Ending Balance	421,975	391,526
Common Stock [Member]
Beginning Balance	13,278	13,288
Net Income	0	0
Amounts reported in other comprehensive income (loss)	0	0
Repurchases of common stock	0	(84)
Dividends, Common Stock	0	0
Share Issuance and Equity-Based Compensation Plans	13	32
Excess Tax Benefit From Stock Option Exercises	0	0
Ending Balance	13,291	13,236
Additional Paid-in Capital [Member]
Beginning Balance	112,475	106,333
Net Income	0	0
Amounts reported in other comprehensive income (loss)	0	0
Repurchases of common stock	0	0
Dividends, Common Stock	0	0
Share Issuance and Equity-Based Compensation Plans	363	1,513
Excess Tax Benefit From Stock Option Exercises	0	104
Ending Balance	112,838	107,950
Retained Earnings [Member]
Beginning Balance	364,414	326,740
Net Income	6,992	12,946
Amounts reported in other comprehensive income (loss)	0	0
Repurchases of common stock	0	(5,775)
Dividends, Common Stock	(4,587)	(4,227)
Share Issuance and Equity-Based Compensation Plans	0	0
Excess Tax Benefit From Stock Option Exercises	0	0
Ending Balance	366,819	329,684
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance	(87,407)	(73,316)
Net Income	0	0
Amounts reported in other comprehensive income (loss)	5,446	5,314
Repurchases of common stock	0	0
Dividends, Common Stock	0	0
Share Issuance and Equity-Based Compensation Plans	0	0
Excess Tax Benefit From Stock Option Exercises	0	0
Ending Balance	(81,961)	(68,002)
Noncontrolling Interest [Member]
Beginning Balance	9,846	8,198
Net Income	622	398
Amounts reported in other comprehensive income (loss)	520	62
Repurchases of common stock	0	0
Dividends, Common Stock	0	0
Share Issuance and Equity-Based Compensation Plans	0	0
Excess Tax Benefit From Stock Option Exercises	0	0
Ending Balance	$ 10,988	$ 8,658