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Derivatives (Tables)
 12 Months Ended
Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
Foreign exchange forward contracts qualifying and designated for hedge accounting treatment were as follows (in thousands USD):
 
 
December 31, 2012
 
December 31, 2011
 
Notional
Amount
 
Unrealized
Net Gain
(Loss)
 
Notional
Amount
 
Unrealized
Net Gain
(Loss)
USD / AUD
$
—

 
$
—

 
$
3,324

 
$
104

USD / CAD
17,620

 
(6
)
 
8,424

 
29

USD / CNY
—

 
—

 
8,130

 
(16
)
USD / EUR
59,510

 
(797
)
 
42,267

 
701

USD / GBP
2,519

 
(3
)
 
1,806

 
19

USD / NZD
—

 
—

 
8,256

 
86

USD / SEK
—

 
—

 
4,520

 
19

USD / MXP
6,954

 
141

 
14,029

 
(146
)
EUR / AUD
—

 
—

 
1,220

 
(48
)
EUR / CHF
—

 
—

 
5,433

 
(22
)
EUR / GBP
2,077

 
46

 
17,201

 
9

EUR / NZD
5,749

 
105

 
7,009

 
505

GBP / CHF
—

 
—

 
929

 
(5
)
GBP / SEK
4,154

 
25

 
1,690

 
12

CHF / SEK
—

 
—

 
271

 
(2
)
DKK / SEK
6,397

 
(47
)
 
—

 
—

NOK / CHF
—

 
—

 
436

 
(1
)
NOK / SEK
3,428

 
(4
)
 
—

 
—

 
$
108,408

 
$
(540
)
 
$
124,945

 
$
1,244
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]
Foreign exchange forward contracts not qualifying or designated for hedge accounting treatment entered into in 2012 and 2011, respectively, and outstanding were as follows (in thousands USD):
 
 
December 31, 2012
 
December 31, 2011
 
Notional
Amount
 
Gain
(Loss)
 
Notional
Amount
 
Gain
(Loss)
CAD / USD
$
22,194

 
$
(90
)
 
$
2,146

 
$
12

EUR / USD
18,060

 
416

 
—

 
—

CHF / USD
2,144

 
42

 
3,419

 
(118
)
GBP / USD
3,514

 
60

 
—

 
—

CAD / AUD
1,508

 
3

 
—

 
—

EUR / AUD
1,928

 
51

 
—

 
—

GBP / AUD
1,356

 
26

 
—

 
—

NOK / AUD
1,039

 
40

 
—

 
—

NZD / AUD
2,128

 
25

 
—

 
—

SEK / CAD
—

 
—

 
2,545

 
52

EUR / CAD
—

 
—

 
4,244

 
(10
)
EUR / DKK
11,555

 
(28
)
 
3,482

 
—

 
$
65,426

 
$
545

 
$
15,836

 
$
(64
)
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block]
The fair values of the company’s derivative instruments were as follows (in thousands):
 
 
December 31, 2012
 
December 31, 2011
 
Assets
 
Liabilities
 
Assets
 
Liabilities
Derivatives designated as hedging instruments under ASC 815
 
 
 
 
 
 
 
Foreign currency forward contracts
$
375

 
$
915

 
$
1,621

 
$
377

Interest rate swap contracts
—

 
316

 
18

 
388

Derivatives not designated as hedging instruments under ASC 815
 
 
 
 
 
 
 
Foreign currency forward contracts
687

 
142

 
64

 
128

Total derivatives
$
1,062

 
$
1,373

 
$
1,703

 
$
893
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]
The effect of derivative instruments on the Statement of Operations and Other Comprehensive Income (OCI) was as follows (in thousands):
Derivatives 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, 2012
 
 
 
 
 
Foreign currency forward contracts
$
(5,547
)
 
$
3,763

 
$
4

Interest rate swap contracts
54

 
—

 
—

 
$
(5,493
)
 
$
3,763

 
$
4

Year ended December 31, 2011
 
 
 
 
 
Foreign currency forward contracts
$
925

 
$
(250
)
 
$
(7
)
Interest rate swap contracts
(370
)
 
—

 
—

 
$
555

 
$
(250
)
 
$
(7
)
 
 
 
 
 
 
Derivatives not designated as hedging
instruments under ASC 815
 
 
 
 
Amount of Gain
Recognized in Income on
Derivatives
Year ended December 31, 2012
 
 
 
 
 
Foreign currency forward contracts
 
 
 
 
$
545

Year ended December 31, 2011
 
 
 
 
 
Foreign currency forward contracts
 
 
 
 
$
83