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New Accounting Pronouncements New Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Increase in tax expense due to GILTI |  |  |  |  |  |  |  |  |  | $ 710 |  |
Services | $ 393,662 | $ 375,830 | $ 379,743 | $ 326,968 | $ 402,747 | $ 375,800 | $ 390,532 | $ 344,700 |  | 1,476,203 | $ 1,513,779 | $ 1,385,785
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  |  |  |  |  |  | (1,170) |  |
Payment for Contingent Consideration Liability, Operating Activities |  |  |  |  |  |  |  |  |  | 29,141 | 42,790 | 44,914
Net Cash Provided by (Used in) Operating Activities |  |  |  |  |  |  |  |  |  | 17,280 | 71,786 | (45,907)
Payment for Contingent Consideration Liability, Investing Activities |  |  |  |  |  |  |  |  |  | 61,313 | 99,873 | 135,693
Cost of Goods and Services Sold | 256,088 | $ 238,690 | $ 253,390 | $ 243,030 | 268,673 | $ 249,418 | $ 267,822 | $ 237,563 |  | 991,198 | 1,023,476 | 936,133
Operating Income (Loss) |  |  |  |  |  |  |  |  |  | 9,696 | 131,959 | 48,431
Net Income (Loss) Available to Common Stockholders, Basic |  |  |  |  |  |  |  |  |  | $ (132,088) | 205,594 | (45,839)
Earnings Per Share, Basic and Diluted |  |  |  |  |  |  |  |  |  | $ (2.31) |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  |  | $ 1,527,839 |  |
Cost of Goods and Services Sold |  |  |  |  |  |  |  |  |  | 1,053,556 |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  | (1,026) |  |
Net Income (Loss) Available to Common Stockholders, Basic |  |  |  |  |  |  |  |  |  | $ (138,971) |  |
Earnings Per Share, Basic and Diluted |  |  |  |  |  |  |  |  |  | $ (2.43) |  |
Accounting Standards Update 2016-18 [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restricted Cash | $ 3,900 |  |  |  | $ 4,600 |  |  |  |  | $ 3,900 | 4,600 | 5,300
Accounting Standards Update 2016-15 [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  |  |  |  |  |  |  |  |  | (29) | $ (42,790) | $ (44,914)
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  |  | 51,636 |  |
Cost of Goods and Services Sold |  |  |  |  |  |  |  |  |  | 62,358 |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  | (10,722) |  |
Net Income (Loss) Available to Common Stockholders, Basic |  |  |  |  |  |  |  |  |  | $ (6,883) |  |
Earnings Per Share, Basic and Diluted |  |  |  |  |  |  |  |  |  | $ (0.12) |  |
Accumulated Deficit |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  |  |  |  |  | $ (1,170) | $ (1,170) |  |

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