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Goodwill and Other Assets (Tables)
 12 Months Ended
Dec. 31, 2012
Goodwill and Other Assets [Abstract]  
Schedule of Goodwill
The changes in carrying amounts of goodwill within the Company’s DNA and DI segments are summarized as follows:
 
DNA
 
DI
 
Total
Goodwill
$
112,163

 
$
377,979

 
$
490,142

Accumulated impairment losses
(13,171
)
 
(207,573
)
 
(220,744
)
Balance at January 1, 2011
$
98,992

 
$
170,406

 
$
269,398

Currency translation adjustment
(50
)
 
(16,285
)
 
(16,335
)
Goodwill
112,113

 
361,694

 
473,807

Accumulated impairment losses
(13,171
)
 
(207,573
)
 
(220,744
)
Balance at December 31, 2011
$
98,942

 
$
154,121

 
$
253,063

Goodwill acquired
—

 
26,003

 
26,003

Currency translation adjustment
63

 
(6,178
)
 
(6,115
)
Goodwill
112,176

 
381,519

 
493,695

Accumulated impairment losses
(13,171
)
 
(207,573
)
 
(220,744
)
Balance at December 31, 2012
$
99,005

 
$
173,946

 
$
272,951