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Business Segment, Geographic and Major Customer Information (Revenue by Geographic Location) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revenue by geographic location |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 77,014 | $ 87,942 | $ 87,030 | $ 82,373 | $ 124,503 | $ 116,761 | $ 105,318 | $ 102,575 | $ 334,359 | $ 449,157 | $ 371,065
U.S. [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue by geographic location |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 273,624 | 370,087 | 319,649
Other countries [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue by geographic location |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 60,735 | $ 79,070 | $ 51,416

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