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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Components of accumulated other comprehensive income (loss)
The following table presents changes in the components of accumulated other comprehensive income (loss) (in thousands):
 
Currency
Translation
 
Employee
Benefit
Plans
 
Total
Balance, December 31, 2012
$
1,855

 
$
(3,154
)
 
$
(1,299
)
Currency translation adjustment, net of income tax benefit of $3,993
(6,363
)
 
—

 
(6,363
)
Changes related to benefit plans, net of income tax expense of $1,603
—

 
4,808

 
4,808

Balance, December 31, 2013
(4,508
)
 
1,654

 
(2,854
)
Currency translation adjustment, net of income tax benefit of $11,102
(20,551
)
 
—

 
(20,551
)
Changes related to benefit plans, net of income tax benefit of $1,245
—

 
(3,736
)
 
(3,736
)
Balance, December 31, 2014
(25,059
)
 
(2,082
)
 
(27,141
)
Currency translation adjustment, net of income tax benefit of $19,593
(32,142
)
 
—

 
(32,142
)
Changes related to benefit plans, net of income tax expense of $240
—

 
721

 
721

Balance, December 31, 2015
$
(57,201
)
 
$
(1,361
)
 
$
(58,562
)