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Segment Reporting (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net Sales to External Customers |  |  |  |  |  |  |  |  | $ 2,725,053 | $ 2,508,257 | $ 2,395,447
Revenue Transactions With Other Operating Segments |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Sales | $ 778,031 | $ 698,799 | $ 653,656 | $ 594,567 | $ 709,699 | $ 650,598 | $ 608,286 | $ 539,674 | 2,725,053 | 2,508,257 | 2,395,447
Total Segment Profit |  |  |  |  |  |  |  |  | 656,584 | 582,997 | 532,107
Depreciation |  |  |  |  |  |  |  |  | 33,458 | 32,743 | 33,087
Assets | 2,549,805 |  |  |  | 2,166,777 |  |  |  | 2,549,805 | 2,166,777 | 1,959,335
Purchase of property, plant and equipment |  |  |  |  |  |  |  |  | (127,426) | (123,957) | (82,506)
Goodwill | 539,838 |  |  |  | 476,378 |  |  |  | 539,838 | 476,378 | 446,284
U.S. Operations Segment |  |  |  |  |  |  |  |  |  |  |
Net Sales to External Customers |  |  |  |  |  |  |  |  | 944,825 | 867,962 | 826,354
Revenue Transactions With Other Operating Segments |  |  |  |  |  |  |  |  | 99,117 | 90,580 | 87,488
Net Sales |  |  |  |  |  |  |  |  | 1,043,942 | 958,542 | 913,842
Segment Profit |  |  |  |  |  |  |  |  | 177,705 | 161,539 | 147,491
Depreciation |  |  |  |  |  |  |  |  | 7,659 | 6,094 | 6,153
Assets | 1,937,688 |  |  |  | 1,747,338 |  |  |  | 1,937,688 | 1,747,338 | 1,487,422
Purchase of property, plant and equipment |  |  |  |  |  |  |  |  | (38,969) | (52,255) | (7,113)
Goodwill | 409,520 |  |  |  | 357,785 |  |  |  | 409,520 | 357,785 | 317,856
Swiss Operations Segment |  |  |  |  |  |  |  |  |  |  |
Net Sales to External Customers |  |  |  |  |  |  |  |  | 133,925 | 130,674 | 133,684
Revenue Transactions With Other Operating Segments |  |  |  |  |  |  |  |  | 563,083 | 524,983 | 498,642
Net Sales |  |  |  |  |  |  |  |  | 697,008 | 655,657 | 632,326
Segment Profit |  |  |  |  |  |  |  |  | 174,447 | 163,663 | 160,763
Depreciation |  |  |  |  |  |  |  |  | 5,551 | 6,199 | 6,488
Assets | 1,374,150 |  |  |  | 1,212,637 |  |  |  | 1,374,150 | 1,212,637 | 1,134,648
Purchase of property, plant and equipment |  |  |  |  |  |  |  |  | (19,589) | (7,260) | (6,650)
Goodwill | 22,171 |  |  |  | 21,239 |  |  |  | 22,171 | 21,239 | 21,841
Western European Operations Segment |  |  |  |  |  |  |  |  |  |  |
Net Sales to External Customers |  |  |  |  |  |  |  |  | 673,776 | 640,558 | 620,128
Revenue Transactions With Other Operating Segments |  |  |  |  |  |  |  |  | 170,820 | 176,501 | 165,532
Net Sales |  |  |  |  |  |  |  |  | 844,596 | 817,059 | 785,660
Segment Profit |  |  |  |  |  |  |  |  | 117,324 | 123,507 | 107,424
Depreciation |  |  |  |  |  |  |  |  | 4,052 | 4,048 | 4,076
Assets | 1,805,294 |  |  |  | 1,120,751 |  |  |  | 1,805,294 | 1,120,751 | 1,010,639
Purchase of property, plant and equipment |  |  |  |  |  |  |  |  | (7,094) | (6,857) | (5,940)
Goodwill | 91,927 |  |  |  | 82,500 |  |  |  | 91,927 | 82,500 | 92,389
Chinese Operations Segment |  |  |  |  |  |  |  |  |  |  |
Net Sales to External Customers |  |  |  |  |  |  |  |  | 452,617 | 386,541 | 376,291
Revenue Transactions With Other Operating Segments |  |  |  |  |  |  |  |  | 232,882 | 219,766 | 214,887
Net Sales |  |  |  |  |  |  |  |  | 685,499 | 606,307 | 591,178
Segment Profit |  |  |  |  |  |  |  |  | 231,860 | 187,924 | 165,532
Depreciation |  |  |  |  |  |  |  |  | 7,168 | 6,879 | 7,086
Assets | 1,068,811 |  |  |  | 702,571 |  |  |  | 1,068,811 | 702,571 | 506,390
Purchase of property, plant and equipment |  |  |  |  |  |  |  |  | (13,246) | (16,288) | (14,770)
Goodwill | 690 |  |  |  | 636 |  |  |  | 690 | 636 | 692
Other Operations Segment |  |  |  |  |  |  |  |  |  |  |
Net Sales to External Customers |  |  |  |  |  |  |  |  | 519,910 | 482,522 | 438,990
Revenue Transactions With Other Operating Segments |  |  |  |  |  |  |  |  | 7,934 | 7,709 | 8,087
Net Sales |  |  |  |  |  |  |  |  | 527,844 | 490,231 | 447,077
Segment Profit |  |  |  |  |  |  |  |  | 72,744 | 64,060 | 50,821
Depreciation |  |  |  |  |  |  |  |  | 3,474 | 3,461 | 2,883
Assets | 310,667 |  |  |  | 277,476 |  |  |  | 310,667 | 277,476 | 260,276
Purchase of property, plant and equipment |  |  |  |  |  |  |  |  | (4,131) | (4,540) | (4,306)
Goodwill | 15,530 |  |  |  | 14,218 |  |  |  | 15,530 | 14,218 | 13,506
Eliminations and Corporate Segment |  |  |  |  |  |  |  |  |  |  |
Net Sales to External Customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Revenue Transactions With Other Operating Segments |  |  |  |  |  |  |  |  | (1,073,836) | (1,019,539) | (974,636)
Net Sales |  |  |  |  |  |  |  |  | (1,073,836) | (1,019,539) | (974,636)
Segment Profit |  |  |  |  |  |  |  |  | (117,496) | (117,696) | (99,924)
Depreciation |  |  |  |  |  |  |  |  | 5,554 | 6,062 | 6,401
Assets | (3,946,805) |  |  |  | (2,893,996) |  |  |  | (3,946,805) | (2,893,996) | (2,440,040)
Purchase of property, plant and equipment |  |  |  |  |  |  |  |  | (44,397) | (36,757) | (43,727)
Goodwill | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 | $ 0

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