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Derivatives (Tables)
 6 Months Ended
Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
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 June 30, 2016 and their effect on the Statement of Comprehensive Income (Loss) were as follows (in thousands):
 
 
 
Gain (Loss)
 
 
 
Three Months Ended
 
Six Months Ended
 
Fair Value
 
June 30, 2016
 
June 30, 2016
Convertible debt conversion long-term liability
$
(28,633
)
 
$
6,565

 
$
5,847

Convertible note hedge long-term asset
23,218

 
(6,079
)
 
(4,757
)
 
$
(5,415
)
 
$
486

 
$
1,090
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):
 
June 30, 2016
 
December 31, 2015
 
Notional
Amount
 
Unrealized
Net Gain
(Loss)
 
Notional
Amount
 
Unrealized
Net Gain
(Loss)
USD / AUD
$
1,529

 
$
(93
)
 
$
2,910

 
$
(83
)
USD / CAD
6,013

 
310

 
3,893

 
181

USD / CNY
7,931

 
(230
)
 
16,786

 
(282
)
USD / EUR
42,624

 
(409
)
 
72,758

 
2,681

USD / GBP
1,111

 
51

 
3,862

 
22

USD / NZD
2,447

 
16

 
4,893

 
37

USD / SEK
2,172

 
(68
)
 
5,128

 
39

USD / MXP
8,889

 
(148
)
 
8,494

 
(284
)
EUR / AUD
353

 
(11
)
 
669

 
(10
)
EUR / CAD
748

 
11

 
1,283

 
(17
)
EUR / CHF
1,273

 
(41
)
 
1,944

 
(17
)
EUR / GBP
19,267

 
983

 
36,567

 
(424
)
EUR / SEK
1,318

 
(15
)
 
2,464

 
(42
)
EUR / NOK
1,615

 
(15
)
 
3,375

 
(55
)
EUR / NZD
2,684

 
437

 
3,609

 
476

AUD / NZD
180

 
8

 
352

 
8

GBP / AUD
432

 
(75
)
 
830

 
(46
)
GBP / CHF
264

 
12

 
463

 
(7
)
GBP / SEK
1,142

 
87

 
2,067

 
(1
)
DKK / SEK
17,951

 
—

 
37,293

 
46

NOK / SEK
1,808

 
(21
)
 
3,524

 
(39
)
 
$
121,751

 
$
789

 
$
213,164

 
$
2,183
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 entered into in 2016 and 2015, respectively, and outstanding were as follows (in thousands USD):
 
June 30, 2016
 
December 31, 2015
 
Notional
Amount
 
Gain
(Loss)
 
Notional
Amount
 
Gain
(Loss)
AUD / USD
$
22,441

 
$
(195
)
 
$
8,051

 
$
337

CAD / USD
—

 
—

 
5,762

 
(4
)
CNY / USD
9,709

 
(224
)
 
9,943

 
(441
)
EUR / USD
—

 
—

 
2,118

 
53

DKK / USD
—

 
—

 
7,927

 
125

GBP / USD
1,037

 
48

 
4,526

 
(106
)
NOK / USD
—

 
—

 
1,838

 
(18
)
EUR / NOK
473

 
(4
)
 
—

 
—

EUR / SEK
169

 
(2
)
 
—

 
—

 
$
33,829

 
$
(377
)
 
$
40,165

 
$
(54
)
Schedule of Derivatives Instruments Statements of Financial Position, Fair Value
The fair values of the company’s derivative instruments were as follows (in thousands):
 
June 30, 2016
 
December 31, 2015
 
Assets
 
Liabilities
 
Assets
 
Liabilities
Derivatives designated as hedging instruments under ASC 815
 
 
 
 
 
 
 
Foreign currency forward exchange contracts
$
2,420

 
$
1,631

 
$
3,626

 
$
1,443

 
 
 
 
 
 
 
 
Derivatives not designated as hedging instruments under ASC 815
 
 
 
 
 
 
 
Foreign currency forward exchange contracts
55

 
432

 
517

 
571

Total derivatives
$
2,475

 
$
2,063

 
$
4,143

 
$
2,014
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 June 30, 2016
 
 
 
 
 
Foreign currency forward exchange contracts
$
(2,059
)
 
$
208

 
$
42

Six months ended June 30, 2016
 
 
 
 
 
Foreign currency forward exchange contracts
$
(931
)
 
$
374

 
$
42

Three months ended June 30, 2015
 
 
 
 
 
Foreign currency forward exchange contracts
$
(379
)
 
$
596

 
$
—

Six months ended June 30, 2015
 
 
 
 
 
Foreign currency forward exchange contracts
$
1,687

 
$
738

 
$
—

 
 
 
 
 
 
Derivatives not designated as hedging
instruments under ASC 815
 
 
 
 
Amount of Gain (Loss)
Recognized in Income on Derivatives
Three months ended June 30, 2016
 
 
 
 
 
Foreign currency forward exchange contracts
 
$
(94
)
Six months ended June 30, 2016
 
 
 
 
 
Foreign currency forward exchange contracts
 
$
(377
)
Three months ended June 30, 2015
 
 
 
 
 
Foreign currency forward exchange contracts
 
$
1,476

Six months ended June 30, 2015
 
 
 
 
 
Foreign currency forward exchange contracts
 
$
(59
)