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Earnings per Share Repurchase of Common Stock (Details) - USD ($) $ in Thousands	3 Months Ended					9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Stock Repurchased and Retired During Period, Value	$ 5,670	$ 14,750	$ 670	$ 670	$ 2,920
10b5-1 share repurchase program [Member]
Stock Repurchase Program, Authorized Amount	$ 75,000					$ 75,000		$ 50,000
Stock Repurchased and Retired During Period, Shares	196,128			23,191		723,528	124,138
Stock Repurchased and Retired During Period, Value	$ 5,700			$ 700		$ 21,100	$ 3,600

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- Definition

Amount of stock repurchase plan authorized.

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- Definition

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 and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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