Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2017	[1]	Sep. 30, 2017	[1]	Jun. 30, 2017	[1]	Mar. 31, 2017	[1]	Dec. 31, 2016	[1]	Sep. 30, 2016	[1]	Jun. 30, 2016	[1]	Mar. 31, 2016	[1]	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Difference between income tax provision computed at the statutory Federal income tax rate and financial statement income tax
Provision at Federal rate of 35%																	$ 30,699	$ 35,000	$ 33,719
State income taxes, net of Federal impact																	1,850	2,662	2,652
Research and experimentation credits																	(2,853)	(71)	(2,135)
Stock award vesting																	(7,882)
Tax uncertainties																	166	(1,597)	(166)
Section 199 manufacturing deduction																	(962)	(4,060)	(2,884)
Foreign rate differential																	162	857	688
Valuation allowance for deferred tax assets																	2,351	1,287	919
Other impact of foreign operations																	3,933	2,157	283
Statutory rate change																	(2,210)
Other																	1,092	882	698
Total income tax provision	$ 6,705		$ 8,806		$ 8,722		$ 2,113		$ 6,814		$ 12,265		$ 6,448		$ 11,590		$ 26,346	$ 37,117	$ 33,774

[1] Fluctuations in our effective income tax rate between quarters generally relates to the accounting for discrete income tax items in any given quarter, and revisions of estimates for certain income tax components during the year. For 2017: Our effective income tax rates for the first, second, third, and fourth quarters were 9%, 43%, 38%, and 31%, respectively. The first quarter 2017 effective income tax rate reflects an approximately $5 million net benefit resulting from Comcast’s exercise of 1.4 million vested stock warrants in January 2017 (see Note 10) and the fourth quarter effective income tax rate includes a $2 million benefit from the remeasurement of U.S.-based net deferred tax liabilities as required under the U.S. Tax reform enacted in December 2017 (see Note 7). For 2016: Our effective income tax rates for the first, second, third, and fourth quarters were 35%, 37%, 41%, and 35%, respectively.