Consolidated Statements of Changes In Shareholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Paid-in Capital	Accumulated Earnings	Loss on Pension Benefit Obligation	Currency Translation Adjustments	Foreign Currency Hedge Adjustment	Currency Hedge Adjustment	Stockholders' Equity, Total	Noncontrolling Interest
Balance at Dec. 31, 2011	$ 104,785	$ 80,502	$ 23,387	$ (28,544)	$ (170)	$ (14,378)		$ (206)	$ 60,591	$ 44,194
Balance (in shares) at Dec. 31, 2011		23,515,000
Public stock offering	75,532	75,532							75,532
Public stock offering (in shares)		5,290,000
Exercise of Common Stock options for cash	774	1,035	(261)						774
Exercise of Common Stock options for cash (in shares)	176,896	177,000
Tax benefit from Exercises of Common Stock options	171		171						171
Common Stock issued to Board of Directors and employees and consultants	429	429							429
Common Stock issued to Board of Directors and employees and consultants (in shares)		155,000
Stock option compensation	823		823						823
Convertible preferred stock dividends	(6,711)			(6,711)					(6,711)
Preferred stock principal paid in common stock	7,780	7,780							7,780
Preferred stock principal paid in common stock (Shares)		601,000
Preferred stock dividend paid in common stock	1,031	1,031							1,031
Preferred stock dividend paid in common stock (Shares)		80,000
Proceeds from subsidiary issuance of equity shares	1,921									1,921
Distribution paid to non-controlling interest	(290)									(290)
Net (loss) gain on pension benefit obligation	(1,032)				(1,032)				(1,032)
Currency translation, net	5,647					4,573			4,573	1,074
Interest rate hedge, net	(18)							(18)	(18)
Net Income	24,321			17,872					17,872	6,449
Balance at Dec. 31, 2012	215,163	166,309	24,120	(17,383)	(1,202)	(9,805)		(224)	161,815	53,348
Balance (in shares) at Dec. 31, 2012		29,818,000
Acquisition of non-controlling interest	(45,637)	42,517	(35,080)						7,437	(53,074)
Acquisition of non-controlling interest (in shares)		3,300,000
Exercise of Common Stock options for cash	4,801	6,624	(1,823)						4,801
Exercise of Common Stock options for cash (in shares)	672,753	673,000
Tax benefit from Exercises of Common Stock options	2,074		2,074						2,074
Common Stock issued to Board of Directors and employees and consultants	1,509	1,509							1,509
Common Stock issued to Board of Directors and employees and consultants (in shares)		184,000
Stock option compensation	1,127		1,127						1,127
Convertible preferred stock dividends	(1,622)			(1,622)					(1,622)
Stock issued upon conversion of preferred stock	15,108	15,108							15,108
Stock issued upon conversion of preferred stock (in shares)		954,000
Distribution paid to non-controlling interest	(6)			(3)					(3)	(3)
Net (loss) gain on pension benefit obligation	144				144				144
Currency translation, net	4,157					5,741			5,741	(1,584)
Interest rate hedge, net	143							143	143
Net Income	35,133			33,820					33,820	1,313
Balance at Dec. 31, 2013	232,094	232,067	(9,582)	14,812	(1,058)	(4,064)		(81)	232,094
Balance (in shares) at Dec. 31, 2013	34,929,334	34,929,000
Exercise of Common Stock options for cash	7,176	9,595	(2,419)						7,176
Exercise of Common Stock options for cash (in shares)	731,142	731,000
Tax benefit from Exercises of Common Stock options	1,831		1,831						1,831
Common Stock issued to Board of Directors and employees and consultants	2,706	2,706							2,706
Common Stock issued to Board of Directors and employees and consultants (in shares)		105,000
Stock option compensation	1,946		1,946						1,946
Cancelation of restricted stock	(1,113)	(1,113)							(1,113)
Cancelation of restricted stock (in shares)		(68,000)
Net (loss) gain on pension benefit obligation	(1,615)				(1,615)				(1,615)
Currency translation, net	(18,996)					(18,996)			(18,996)
Foreign currency hedge, net	(10)						(10)		(10)
Interest rate hedge, net	81							81	81
Net Income	70,119			70,119					70,119
Balance at Dec. 31, 2014	$ 294,219	$ 243,255	$ (8,224)	$ 84,931	$ (2,673)	$ (23,060)	$ (10)		$ 294,219
Balance (in shares) at Dec. 31, 2014	35,696,742	35,697,000