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Stock Repurchase Program (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Feb. 28, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Feb. 13, 2019	Mar. 31, 2018	Feb. 28, 2017	Feb. 29, 2016	Dec. 31, 2015
2012 And 2014 Plan
Class of Stock
Stock repurchase program, remaining number of shares authorized to be repurchased (in shares)									56,000
February 2016 Plan
Class of Stock
Stock repurchased program authorized number of shares (in shares)								1,000,000
February 2016 Plan | Treasury Stock
Class of Stock
Stock repurchased during period (in shares)				1,056,000
Aggregate purchase price of shares repurchased				$ 9.5
February 2017 Plan
Class of Stock
Stock repurchased program authorized number of shares (in shares)							1,000,000
February 2017 Plan | Treasury Stock
Class of Stock
Stock repurchased during period (in shares)			1,000,000
Aggregate purchase price of shares repurchased			$ 9.7
March 2018 Plan
Class of Stock
Stock repurchased program authorized number of shares (in shares)						500,000
Stock repurchased during period (in shares)		500,000
Aggregate purchase price of shares repurchased		$ 5.3
Subsequent Event | February 2019 Plan
Class of Stock
Stock repurchased program authorized number of shares (in shares)					100,000
Stock repurchased during period (in shares)	100,000
Aggregate purchase price of shares repurchased	$ 1.5

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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