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Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Leases The Company has various noncancellable operating leases for buildings, office space and equipment. Rent expense was $15,325, $12,939 and $11,166 for 2017, 2016 and 2015, respectively. Minimum rental commitments under noncancellable leases in years 2018 through 2022 are $11,926, $7,760, $5,613, $4,890 and $2,265, respectively, and $7,372 thereafter. The rental expense and minimum rental commitments of leases with step rent provisions are recognized on a straight-line basis over the lease term. Product Warranties The Company provides product warranties in connection with the sale of certain products. From time to time, the Company is subject to customer claims with respect to product warranties. Liabilities related to product warranties and extended warranties were not material as of December 31, 2017 or 2016.