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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		12 Months Ended
	Oct. 21, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Class of Stock [Line Items]
Cash dividends to common stockholders		$ 1,655	$ 1,518	$ 6,223
Cash dividends paid per common share (usd per share)		$ 0.27	$ 0.25
Dividends declared per common share (usd per share)	$ 0.27
Shares withheld for tax withholding and exercise of options		4,715
Amount of shares withheld for tax withholding and exercise of options		$ 342
Shares withheld for tax withholding and exercise of options, weighted average price		$ 68.80
Performance-based stock awards
Class of Stock [Line Items]
Vesting period of performance-based stock awards		3 years
Performance-based stock awards | Minimum
Class of Stock [Line Items]
Vesting percentage of performance-based awards		0.00%
Performance-based stock awards | Maximum
Class of Stock [Line Items]
Vesting percentage of performance-based awards		200.00%

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Paragraph 1
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