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Derivatives (Tables)
 12 Months Ended
Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Notional Amounts of Outstanding Derivative Positions
Foreign exchange forward contracts qualifying and designated for hedge accounting treatment were as follows (in thousands USD):
 
December 31, 2016
 
December 31, 2015
 
Notional
Amount
 
Unrealized
Net Gain
(Loss)
 
Notional
Amount
 
Unrealized
Net Gain
(Loss)
USD / AUD
$
5,841

 
$
316

 
$
2,910

 
$
(83
)
USD / CAD
2,604

 
(18
)
 
3,893

 
181

USD / CHF
370

 
15

 
—

 
—

USD / CNY
11,252

 
(301
)
 
16,786

 
(282
)
USD / EUR
60,387

 
1,826

 
72,758

 
2,681

USD / GBP
3,253

 
(75
)
 
3,862

 
22

USD / NZD
9,650

 
(64
)
 
4,893

 
37

USD / SEK
4,923

 
146

 
5,128

 
39

USD / MXP
6,148

 
(417
)
 
8,494

 
(284
)
EUR / AUD
506

 
6

 
669

 
(10
)
EUR / CAD
—

 
—

 
1,283

 
(17
)
EUR / CHF
—

 
—

 
1,944

 
(17
)
EUR / GBP
14,511

 
(686
)
 
36,567

 
(424
)
EUR / NOK
2,503

 
(25
)
 
3,375

 
(55
)
EUR / SEK
—

 
—

 
2,464

 
(42
)
EUR / NZD
3,777

 
16

 
3,609

 
476

GBP / AUD
503

 
34

 
830

 
(46
)
GBP / CHF
215

 
(10
)
 
463

 
(7
)
GBP / SEK
1,389

 
(42
)
 
2,067

 
(1
)
AUD / NZD
—

 
—

 
352

 
8

CHF / DKK
595

 
(2
)
 
—

 
—

DKK / SEK
31,978

 
49

 
37,293

 
46

NOK / CHF
1,335

 
(13
)
 
—

 
—

NOK / SEK
2,618

 
21

 
3,524

 
(39
)
 
$
164,358

 
$
776

 
$
213,164

 
$
2,183
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location
Foreign exchange forward contracts not qualifying or designated for hedge accounting treatment entered into in 2016 and 2015, respectively, and outstanding were as follows (in thousands USD):
 
December 31, 2016
 
December 31, 2015
 
Notional
Amount
 
Gain
(Loss)
 
Notional
Amount
 
Gain
(Loss)
AUD / USD
$
5,800

 
$
204

 
$
8,051

 
$
337

CAD / USD
—

 
—

 
5,762

 
$
(4
)
CNY / USD
5,556

 
(24
)
 
9,943

 
(441
)
EUR / USD
—

 
—

 
2,118

 
53

DKK / USD
—

 
—

 
7,927

 
125

GBP / USD
—

 
—

 
4,526

 
(106
)
NZD / AUD
3,264

 
15

 
—

 
—

NOK / USD
—

 
—

 
1,838

 
(18
)
 
$
14,620

 
$
195

 
$
40,165

 
$
(54
)
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location
The fair values of the company’s derivative instruments were as follows (in thousands):
 
December 31, 2016
 
December 31, 2015
 
Assets
 
Liabilities
 
Assets
 
Liabilities
Derivatives designated as hedging instruments under ASC 815
 
 
 
 
 
 
 
Foreign currency forward exchange contracts
$
2,535

 
$
1,759

 
$
3,626

 
$
1,443

Derivatives not designated as hedging instruments under ASC 815
 
 
 
 
 
 
 
Foreign currency forward exchange contracts
219

 
24

 
517

 
571

 
$
2,754

 
$
1,783

 
$
4,143

 
$
2,014
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss)
The effect of derivative instruments on the Statement of Operations and Other Comprehensive Income (OCI) was as follows, net of tax (in thousands):
Derivatives (foreign currency forward exchange contracts) in ASC 815 cash flow hedge relationships
Amount of Gain
(Loss) Recognized in OCI on Derivatives
(Effective Portion)
 
Amount of Gain (Loss)
Reclassified from
Accumulated OCI into
Income (Effective
Portion)
 
Amount of Gain (Loss)
Recognized in Income
on Derivatives (Ineffective Portion
and Amount Excluded from
Effectiveness Testing)
Year ended December 31, 2016
$
989

 
$
2,252

 
$
40

Year ended December 31, 2015
$
3,545

 
$
991

 
$
(11
)
 
 
 
 
 
 
Derivatives (foreign currency forward exchange contracts) not designated as hedging instruments under ASC 815
Amount of Gain (Loss)
Recognized in Income on
Derivatives
 
 
 
 
Year ended December 31, 2016
$
195

 
 
 
 
Year ended December 31, 2015
$
(54
)
 
 
 
 
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]
The fair values of the outstanding convertible note derivatives as of December 31, 2016 and their effect on the Statement of Comprehensive Income (Loss) were as follows (in thousands):
 
Fair Value
 
Gain (Loss)
Convertible debt conversion long-term liability
$
(30,708
)
 
$
3,772

Convertible note hedge long-term asset
25,471

 
(2,504
)
 
$
(5,237
)
 
$
1,268