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Net Income Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Income Per Common Share
Number of outstanding options not included in computation of Diluted EPS (in shares)	372,600	451,000
Numerator
Net income	$ 54,362	$ 34,786	[1]
Denominator
Weighted average number of common shares outstanding	51,921,000	51,820,000	[1]
Effect of outstanding share-based awards	1,112,000	1,382,000
Weighted average number of shares for diluted net income per common share	53,033,000	53,202,000	[1]
Basic earnings per-share (in dollars per share)	$ 1.05	$ 0.67	[1]
Diluted earnings per-share (in dollars per share)	$ 1.03	$ 0.65	[1]
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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