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Derivatives (Tables)
 9 Months Ended
Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Notional Amounts of Outstanding Derivative Positions
Outstanding foreign currency forward exchange contracts qualifying and designated for hedge accounting treatment were as follows (in thousands USD):
 
September 30, 2017
 
December 31, 2016
 
Notional
Amount
 
Unrealized
Net Gain
(Loss)
 
Notional
Amount
 
Unrealized
Net Gain
(Loss)
USD / AUD
$
4,341

 
$
16

 
$
5,841

 
$
316

USD / CAD
554

 
53

 
2,604

 
(18
)
USD / CNY
954

 
17

 
11,252

 
(301
)
USD / CHF
90

 
—

 
370

 
15

USD / EUR
42,200

 
(1,403
)
 
60,387

 
1,826

USD / GBP
1,645

 
(22
)
 
3,253

 
(75
)
USD / NZD
6,930

 
67

 
9,650

 
(64
)
USD / SEK
1,027

 
(112
)
 
4,923

 
146

USD / MXP
1,517

 
142

 
6,148

 
(417
)
EUR / AUD
139

 
3

 
506

 
6

EUR / GBP
12,184

 
398

 
14,511

 
(686
)
EUR / NOK
704

 
1

 
2,503

 
(25
)
EUR / NZD
3,133

 
(9
)
 
3,777

 
16

GBP / AUD
137

 
8

 
503

 
34

GBP / CHF
135

 
(1
)
 
215

 
(10
)
GBP / SEK
952

 
74

 
1,389

 
(42
)
CHF / DKK
60

 
4

 
595

 
(2
)
DKK / SEK
1,352

 
56

 
31,978

 
49

NOK / CHF
349

 
(23
)
 
1,335

 
(13
)
NOK / SEK
810

 
40

 
2,618

 
21

 
$
79,213

 
$
(691
)
 
$
164,358

 
$
776
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location
Foreign currency forward exchange contracts not qualifying or designated for hedge accounting treatment, as well as ineffective hedges, entered into in 2017 and 2016, respectively, and outstanding were as follows (in thousands USD):
 
September 30, 2017
 
December 31, 2016
 
Notional
Amount
 
Gain
(Loss)
 
Notional
Amount
 
Gain
(Loss)
AUD / USD
$
12,300

 
$
122

 
$
5,800

 
$
204

CNY / USD
3,354

 
56

 
5,556

 
(24
)
EUR / USD
2,145

 
(159
)
 
—

 
—

GBP / USD
496

 
(18
)
 
—

 
—

NZD / USD
4,000

 
47

 
—

 
—

DKK / CHF
120

 
7

 
—

 
—

AUD / NZD
2,602

 
9

 
3,264

 
15

EUR / NOK
7

 
—

 
—

 
—

 
$
25,024

 
$
64

 
$
14,620

 
$
195
Schedule of Derivatives Instruments Statements of Financial Position, Fair Value
The fair values of the company’s derivative instruments were as follows (in thousands):
 
September 30, 2017
 
December 31, 2016
 
Assets
 
Liabilities
 
Assets
 
Liabilities
Derivatives designated as hedging instruments under ASC 815
 
 
 
 
 
 
 
Foreign currency forward exchange contracts
$
997

 
$
1,688

 
$
2,535

 
$
1,759

Derivatives not designated as hedging instruments under ASC 815
 
 
 
 
 
 
 
Foreign currency forward exchange contracts
241

 
177

 
219

 
24

Total derivatives
$
1,238

 
$
1,865

 
$
2,754

 
$
1,783
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss)
The effect of derivative instruments on Accumulated Other Comprehensive Income (OCI) and the Statement of Comprehensive Income (Loss) and was as follows (in thousands):
Derivatives in ASC 815 cash flow hedge
relationships
Amount of Gain
(Loss) Recognized  in Accumulated 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)
Three months ended September 30, 2017
 
 
 
 
 
Foreign currency forward exchange contracts
$
(578
)
 
$
(395
)
 
$
(121
)
Nine months ended September 30, 2017
 
 
 
 
 
Foreign currency forward exchange contracts
$
(1,149
)
 
$
205

 
$
(114
)
Three months ended September 30 2016
 
 
 
 
 
Foreign currency forward exchange contracts
$
828

 
$
698

 
$
30

Nine months ended September 30, 2016
 
 
 
 
 
Foreign currency forward exchange contracts
$
(103
)
 
$
1,072

 
$
72

 
 
 
 
 
 
Derivatives not designated as hedging
instruments under ASC 815
 
 
 
 
Amount of Gain (Loss)
Recognized in Income on Derivatives
Three months ended September 30, 2017
 
 
 
 
 
Foreign currency forward exchange contracts
 
$
(53
)
Nine months ended September 30, 2017
 
 
 
 
 
Foreign currency forward exchange contracts
 
$
64

Three months ended September 30, 2016
 
 
 
 
 
Foreign currency forward exchange contracts
 
$
271

Nine months ended September 30, 2016
 
 
 
 
 
Foreign currency forward exchange contracts
 
$
(106
)
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 September 30, 2017 and their effect on the Statement of Comprehensive Income (Loss) were as follows (in thousands):
 
 
 
Gain (Loss)
 
Gain (Loss)
 
Fair Value
 
Three Months Ended
 
Nine Months Ended
 
September 30, 2017
 
September 30, 2017
 
September 30, 2016
 
September 30, 2017
 
September 30, 2016
Convertible 2021 debt conversion long-term liability
$
(47,557
)
 
$
(15,330
)
 
$
7,732

 
$
(16,849
)
 
$
13,579

Convertible 2022 debt conversion long-term liability
(47,738
)
 
(14,487
)
 
—

 
(18,879
)
 
—

Convertible 2021 note hedge long-term asset
41,619

 
14,189

 
(6,540
)
 
16,148

 
(11,297
)
Convertible 2022 note hedge long-term asset
41,660

 
13,078

 
—

 
16,880

 
—

Net fair value and net gains (losses) on convertible debt derivatives
$
(12,016
)
 
$
(2,550
)
 
$
1,192

 
$
(2,700
)
 
$
2,282