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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The components of accumulated other comprehensive income (loss) were as follows (amounts in thousands):

 
Foreign currency translation adjustment
 
Changes in fair value of derivative, net of tax
 
Accumulated other comprehensive income (loss)
Balance at December 31, 2011
$
(1,658
)
 
$
(380
)
 
$
(2,038
)
Other comprehensive income
854

 
(21
)
 
833

Balance at December 31, 2012
(804
)
 
(401
)
 
(1,205
)
Other comprehensive income
1,128

 
193

 
1,321

Balance at December 31, 2013
324

 
(208
)
 
116

Other comprehensive income
(4,772
)
 
86

 
(4,686
)
Balance at December 31, 2014
$
(4,448
)
 
$
(122
)
 
$
(4,570
)