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Derivative Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Fair Values of Derivative Assets and Liabilities
The fair values of derivative assets and liabilities, net, all of which are classified as Level 2, reported within ‘Accrued expenses and other liabilities’ in the consolidated balance sheets were:
 
December 31, 2017
 
December 31, 2016
 
Derivative Assets
 
Derivative Liabilities
 
Derivative Assets
 
Derivative Liabilities
 
(in thousands)
Forward foreign currency exchange contracts

$
1,241

 
$
(1,647
)
 
$
6,541

 
$
(6,698
)
Netting of counterparty contracts
(1,241
)
 
1,241

 
(6,541
)
 
6,541

  Foreign currency forward contract derivatives
$
—

 
$
(406
)
 
$
—

 
$
(157
)
Summary of Derivative Financial Instruments Notional Amounts on Outstanding Positions
The notional amounts of outstanding foreign currency forward exchange contracts shown below report the total U.S. Dollar equivalent position and the net contract fair values for each foreign currency position.
 
December 31, 2017
 
December 31, 2016
 
Notional
 
Fair Value
 
Notional
 
Fair Value
 
(in thousands)
Singapore Dollar
$
73,455

 
$
364

 
$
94,763

 
$
(2,611
)
Euro
37,718

 
(122
)
 
71,228

 
(1,441
)
Japanese Yen
30,688

 
(89
)
 
87,171

 
4,180

South Korean Won
15,888

 
(134
)
 
8,278

 
407

British Pound Sterling
13,233

 
80

 
14,332

 
(660
)
Other currencies
53,698

 
(505
)
 
52,449

 
(32
)
Total
$
224,680

 
$
(406
)
 
$
328,221

 
$
(157
)
 
 
 
 
 
 
 
 
Latest maturity date
January 2018
 
 
January 2017
 
Schedule of Gains / Losses from Foreign Currency Transactions and Derivative Contracts
Amounts reported in ‘Foreign currency gain (loss), net’ in the consolidated statements of operations include both realized and unrealized gains (losses) from foreign currency transactions and derivative contracts and were as follows:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(in thousands)
Foreign currency transaction gains
$
2,284

 
$
10,814

 
$
3,980

Foreign currency forward exchange contracts losses
(1,721
)
 
(13,268
)
 
(7,312
)
Foreign currency gain (loss), net
$
563

 
$
(2,454
)
 
$
(3,332
)