Summary of Significant Accounting Policies - Schedule of Topic 606 Impact (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Condensed Consolidated Statement of Operations
Revenue from services	$ 211,315	$ 228,545	$ 228,545
Revenue from transfer of intellectual property and other	15,748	15,606	15,606
Selling, general and administrative	91,519	109,944	109,944
Research and development	32,887	26,557	26,557
Condensed Consolidated Balance Sheet
Prepaid Expense and Other Assets, Current	40,946		42,513
Accrued Liabilities, Current	217,133		230,301
Other Liabilities, Noncurrent	233,622		239,955
Retained Earnings (Accumulated Deficit)	(1,075,197)		(1,036,959)
Condensed Consolidated Statement of Cash Flows
Net loss	$ (43,114)	$ (34,503)	(34,503)
Contract liabilities			(13,849)
As originally reported
Condensed Consolidated Statement of Operations
Revenue from services			255,286
Revenue from transfer of intellectual property and other			18,579
Selling, general and administrative			136,685
Research and development			26,022
Condensed Consolidated Balance Sheet
Prepaid Expense and Other Assets, Current			37,113
Accrued Liabilities, Current			215,102
Other Liabilities, Noncurrent			219,954
Retained Earnings (Accumulated Deficit)			(1,007,159)
Condensed Consolidated Statement of Cash Flows
Net loss			(30,995)
Contract liabilities			(17,357)
Accounting Standards Update 2014-09 | Effect of change
Condensed Consolidated Statement of Operations
Revenue from services			(26,741)
Revenue from transfer of intellectual property and other			(2,973)
Selling, general and administrative			(26,741)
Research and development			535
Condensed Consolidated Balance Sheet
Prepaid Expense and Other Assets, Current			5,400
Accrued Liabilities, Current			15,199
Other Liabilities, Noncurrent			20,001
Retained Earnings (Accumulated Deficit)			(29,800)
Condensed Consolidated Statement of Cash Flows
Net loss			(3,508)
Contract liabilities			$ 3,508