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11. Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Other Significant Noncash Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | $ (828,500) | $ 269,300 | $ 268,000 | $ 656,800 | $ 82,700 | $ 22,100 | $ 5,000 | $ 12,400 | $ 365,614 | $ 122,249 | $ 26,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 138,100 | 148,700 | 142,900
Share-based compensation |  |  |  |  |  |  |  |  | 27,800 | 23,400 | 19,700
Gains on disposition of securities |  |  |  |  |  |  |  |  | (1,600) | (100) | (800)
Other than Temporary Impairment Losses on Investments |  |  |  |  |  |  |  |  | 800 | 7,000 | 600
Changes in fair market value of equity securities |  |  |  |  |  |  |  |  | (606,200) | 0 | 0
Losses on dispositions of fixed assets |  |  |  |  |  |  |  |  | 2,000 | 8,100 | 600
Gain on sale of land |  |  |  |  |  |  |  |  | (4,100) | 0 | 0
Gain on divestiture of a product line |  |  |  |  |  |  |  |  | (5,100) | 0 | 0
Excess tax benefits from share-based compensation |  |  |  |  |  |  |  |  | 0 | 0 | (1,506)
Changes in fair value of contingent consideration |  |  |  |  |  |  |  |  | (6,200) | (18,100) | (400)
Decrease (increase) in accounts receivable, net |  |  |  |  |  |  |  |  | 59,700 | (64,100) | 12,500
Increase in inventories, net |  |  |  |  |  |  |  |  | (12,900) | (47,700) | (57,100)
Increase in Other Current Assets |  |  |  |  |  |  |  |  | (15,300) | (35,700) | (6,800)
(Decrease) increase in accounts payable and other current liabilities |  |  |  |  |  |  |  |  | (45,600) | 7,800 | 30,100
(Decrease) increase in Income Taxes Payable |  |  |  |  |  |  |  |  | (20,900) | (22,400) | 10,700
Increase (decrease) in deferred income taxes |  |  |  |  |  |  |  |  | 120,900 | (82,000) | (51,400)
Other |  |  |  |  |  |  |  |  | 4,900 | 5,100 | 5,800
Decrease in other long term assets |  |  |  |  |  |  |  |  | 1,100 | 2,300 | 12,500
(Decrease) increase in Other Long Term Liabilities |  |  |  |  |  |  |  |  | (10,000) | 38,100 | 10,400
Impairment losses on goodwill and long-lived assets | $ 292,500 |  |  |  |  |  |  |  | 292,513 | 11,506 | 62,305
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 285,494 | 104,137 | 216,066
Noncash purchased property, plant and equipment |  |  |  |  |  |  |  |  | 5,700 | 0 | 7,200
Noncash Purchased Marketable Securities and Investments |  |  |  |  |  |  |  |  | $ 800 | $ 2,800 | $ 600

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