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Other Income, Net - Disposal of Product Line (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
May. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]          
Net proceeds from sale of Source product line       $ 0 $ 14,394
Gain on sale of Source product line   $ 0 $ 6,522 $ 0 $ 6,522
Systems [Member]          
Segment Reporting Information [Line Items]          
Net proceeds from sale of Source product line $ 14,400        
Gain on sale of Source product line 6,500        
Reduction due to sale of Source product line $ 5,100