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Stock-Based Compensation - Summary of stock option activity (Details) - Stock Option [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Options
Outstanding beginning (in shares)	165,920	245,717	730,605
Exercised (in shares)	(88,053)	(79,797)	(443,283)
Forfeited (in shares)			(933)
Expired (in shares)	(1,103)		(40,672)
Outstanding ending (in shares)	76,764	165,920	245,717
Weighted-Average Exercise Price
Outstanding beginning (in dollars per share)	$ 21.92	$ 19.82	$ 16.40
Exercised (in dollars per share)	21.54	15.43	14.03
Forfeited (in dollars per share)			24.68
Expired (in dollars per share)	21.16		21.40
Outstanding ending (in dollars per share)	$ 22.33	$ 21.92	$ 19.82
Term and Intrinsic Value
Outstanding Weighted Average Remaining Contractual Term	2 years 10 months 24 days	4 years 2 months 12 days	4 years 4 months 24 days
Outstanding, Aggregate Intrinsic Value	$ 446	$ 2,292	$ 4,396

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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