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Income Tax Expense	3 Months Ended
Income Tax Expense	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Tax Expense	The effective tax rates for the three months ended March 31, 2017 and 2016 were 14.0% and 22.5%, respectively. Income tax expense of $2.9 million in the first quarter of 2017 decreased by $1.5 million compared to $4.4 million in the same period in 2016, due to, among other things, the utilization of research tax credits and the carry back of net operating losses. On March 29, 2017, the Prime Minister of the United Kingdom ("UK") formally notified the European Council of the UK's intention to withdraw from the European Union (EU) under Article 50 of the Treaty of Lisbon. The UK's formal withdrawal will impact tax exemptions and reliefs on intra-European transactions between our UK affiliates and EU companies. In addition, it may impact transactions between our UK affiliates and non-EU based companies as EU tax treaties may no longer apply to these transactions. Due to the uncertainty involved in evaluating the effect of the loss of tax exemptions and reliefs, we are unable to estimate the impact of these changes at this time. We will continue to monitor developments in this area.