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Reportable Segments and Geographic Information - Reconcilation from Net Income to Gross Margin (Details 4) - USD ($) $ in Thousands | 2 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reconciliation of net income to gross margin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  | $ (7,839) | $ (14,998) | $ 39,970 |  | $ 42,036 | $ 18,713 | $ 32,763 | $ 24,972 | $ 51,476 | $ 17,133 | $ 93,512 | $ (125,697) | $ 88,661 | $ 126,606
Selling, general and administrative | $ 600 |  | 32,621 | 31,357 | 32,568 |  | 32,683 | 31,286 | 33,739 | 63,925 | 65,025 | 96,546 | 97,708 | 131,919 | 132,651 | 118,851
Depreciation and amortization |  |  | 58,087 | 57,539 | 57,013 |  | 54,101 | 52,965 | 49,356 | 114,552 | 102,321 | 172,639 | 156,422 | 229,127 | 212,268 | 187,476
Long-lived asset impairment |  |  | 19,933 | 9,510 | 8,153 |  | 11,341 | 9,847 | 3,807 | 17,663 | 13,654 | 37,596 | 24,995 | 124,979 | 42,828 | 16,696
Restructuring and other charges |  |  | 289 | 1,193 | 0 |  | 219 | 353 | 4,822 | 1,193 | 5,175 | 1,482 | 5,394 | 4,745 | 5,394 | 0
Goodwill impairment |  | $ 3,700 |  |  |  |  |  |  |  |  |  |  |  | 3,738 | 0 | 0
Interest expense |  |  | 27,996 | 28,079 | 26,791 |  | 25,555 | 32,358 | 27,824 | 54,870 | 60,182 | 82,866 | 85,737 | 107,617 | 112,273 | 112,194
Debt extinguishment costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,201 | 0 | 0
Other (income) expense, net |  |  | 2,155 | (2,482) | (550) |  | (1,751) | (903) | (236) | (3,032) | (1,139) | (877) | (2,890) | (2,079) | (5,475) | (22,535)
Provision for (benefit from) income taxes |  |  | 2,367 | (1,529) | (740) |  | (12,074) | (8,289) | (17,003) | (2,269) | (25,292) | 98 | (37,366) | 53,189 | (28,066) | (17,840)
Income from discontinued operations, net of tax |  | $ (9,100) | $ (10,110) | $ 19,328 | $ (33,788) | $ (12,300) | $ (32,459) | $ (21,806) | $ (39,221) | $ (14,460) | $ (61,027) | $ (24,570) | $ (93,486) | (33,677) | (105,774) | (129,654)
Gross margin |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 503,062 | $ 454,760 | $ 391,794

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