Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended			12 Months Ended
	Nov. 30, 2016	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Income tax benefits related to research and development credits						$ 3,300	$ 2,600
Provision for income taxes						(18,172)	(54,524)	$ (57,394)
Deferred income tax (benefit)						(40,769)	18,213	35,110
Provisional benefit recorded related to remeasurement of deferred tax balance due to tax reform						38,000
Estimated undistributed earnings from non-United States subsidiaries				$ 46,300			46,300
Undistributed foreign earnings from foreign subsidiaries						56,300
Valuation allowance				44,879		45,166	44,879
Unrecognized tax benefits				21,179		20,325	21,179	34,301	$ 35,663
Unrecognized tax benefits subject to indemnification						8,300
Accrual for tax interest and penalties				9,300		9,500	9,300
Interest and penalties recognized						200	700	200
Unrecognized Tax Benefits and associated interest and penalties, that Would Not Impact Effective Tax Rate						14,000
Expiration of the statute of limitations for the assessment of taxes						2,011	2,215	0
Investor [Member]
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits that would have an impact on the effective tax rate				13,000		12,000	13,000
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards				176,600		171,600	176,600
Operating loss carryforwards, subject to expiration						37,600
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards				271,100		281,800	271,100
Operating loss carryforwards, subject to expiration						49,800
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards				9,900		10,700	9,900
FAFC [Member]
Operating Loss Carryforwards [Line Items]
Provision for income taxes							14,400
Reversal of unrecognized tax benefits	$ (13,200)
Reversal of accrued interest and penalties	$ (8,700)
Accrued interest and penalties related to various taxing jurisdictions						6,200
Restatement Adjustment [Member]
Operating Loss Carryforwards [Line Items]
Provision for income taxes		$ (3,000)	$ (1,300)	$ (3,100)				$ 9,400	$ (2,000)
Deferred income tax (benefit)						$ (4,300)	$ (3,100)
Forecast [Member]
Operating Loss Carryforwards [Line Items]
Expiration of the statute of limitations for the assessment of taxes					$ 7,000