Consolidated Statement of Changes in Stockholders Equity - USD ($) $ in Thousands		Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss)	Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principle - equity securities	[1]	$ (3,930)			$ (3,930)
Beginning balance (in shares) at Dec. 31, 2017			45,189,000
Beginning balance at Dec. 31, 2017		1,140,717	$ 452	$ 53,870	1,214,840	$ (178,607)	$ 50,162
Balance at beginning of period, adjusted at Dec. 31, 2017		1,136,787	$ 452	53,870	1,210,910	(178,607)	50,162
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		23,232			21,106		2,126
Currency translation adjustments		29,941				22,920	7,021
Distributions to noncontrolling interest		(11,807)					(11,807)
Vesting of nonvested shares, shares			86,000
Vesting of restricted stock		0	$ 1	(1)
Share-based compensation expense		2,415		2,415
Employee stock relinquished for payment of taxes		(2,013)		(2,013)
Ending balance (in shares) at Mar. 31, 2018			45,275,000
Ending balance at Mar. 31, 2018		1,178,555	$ 453	54,271	1,232,016	(155,687)	47,502
Beginning balance (in shares) at Dec. 31, 2017			45,189,000
Beginning balance at Dec. 31, 2017		1,140,717	$ 452	53,870	1,214,840	(178,607)	50,162
Balance at beginning of period, adjusted at Dec. 31, 2017		1,136,787	$ 452	53,870	1,210,910	(178,607)	50,162
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash flow hedges		0
Debt securities available-for-sale		0
Ending balance (in shares) at Jun. 30, 2018			45,300,000
Ending balance at Jun. 30, 2018		1,140,693	$ 453	56,410	1,251,604	(209,167)	41,393
Beginning balance (in shares) at Mar. 31, 2018			45,275,000
Beginning balance at Mar. 31, 2018		1,178,555	$ 453	54,271	1,232,016	(155,687)	47,502
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		21,624			19,588		2,036
Currency translation adjustments		(60,697)				(53,480)	(7,217)
Cash flow hedges		0
Debt securities available-for-sale		0
Distributions to noncontrolling interest		(928)					(928)
Vesting of nonvested shares, shares			25,000
Vesting of restricted stock		0	$ 0	0
Share-based compensation expense		2,146		2,146
Employee stock relinquished for payment of taxes		(7)		(7)
Ending balance (in shares) at Jun. 30, 2018			45,300,000
Ending balance at Jun. 30, 2018		$ 1,140,693	$ 453	56,410	1,251,604	(209,167)	41,393
Beginning balance (in shares) at Dec. 31, 2018		45,304,000	45,304,000
Beginning balance at Dec. 31, 2018		$ 1,123,969	$ 453	60,303	1,276,473	(242,109)	28,849
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		16,912			15,227		1,685
Currency translation adjustments		(1,173)				(742)	(431)
Cash flow hedges		(5,715)				(5,715)
Debt securities available-for-sale		45				45
Distributions to noncontrolling interest		(6,877)					(6,877)
Contributions from noncontrolling interest		89					89
Vesting of nonvested shares, shares			80,000
Vesting of restricted stock		0	$ 1	(1)
Share-based compensation expense		2,314		2,314
Employee stock relinquished for payment of taxes		(1,437)		(1,437)
Other		(2,088)		(2,088)
Ending balance (in shares) at Mar. 31, 2019			45,384,000
Ending balance at Mar. 31, 2019		$ 1,126,039	$ 454	59,091	1,291,700	(248,521)	23,315
Beginning balance (in shares) at Dec. 31, 2018		45,304,000	45,304,000
Beginning balance at Dec. 31, 2018		$ 1,123,969	$ 453	60,303	1,276,473	(242,109)	28,849
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash flow hedges		(13,717)
Debt securities available-for-sale		$ 82
Ending balance (in shares) at Jun. 30, 2019		45,409,000	45,409,000
Ending balance at Jun. 30, 2019		$ 1,150,857	$ 454	61,705	1,310,319	(252,124)	30,503
Beginning balance (in shares) at Mar. 31, 2019			45,384,000
Beginning balance at Mar. 31, 2019		1,126,039	$ 454	59,091	1,291,700	(248,521)	23,315
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		22,200			18,619		3,581
Currency translation adjustments		4,740				4,362	378
Cash flow hedges		(8,002)				(8,002)
Debt securities available-for-sale		37				37
Contributions from noncontrolling interest		3,229					3,229
Vesting of nonvested shares, shares			25,000
Vesting of restricted stock		0	$ 0	0
Share-based compensation expense		2,620		2,620
Employee stock relinquished for payment of taxes		$ (6)		(6)
Ending balance (in shares) at Jun. 30, 2019		45,409,000	45,409,000
Ending balance at Jun. 30, 2019		$ 1,150,857	$ 454	$ 61,705	$ 1,310,319	$ (252,124)	$ 30,503

[1] Relates to the adoption of FASB ASU 2016-01, "Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities" ("ASU 2016-01"). Refer to Note 3 for further detail.