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Share Repurchase Program Share Repurchase Program (Narrative) (Details) - USD ($)		12 Months Ended
	Aug. 18, 2017	Dec. 31, 2018	Dec. 31, 2017	Oct. 25, 2017	Feb. 25, 2016
Related Party Transaction [Line Items]
Authorized amount				$ 40,000,000.0	$ 25,000,000.0
Authorized amount, additional				$ 15,000,000.0
Treasury stock acquired, shares		1,101,969	574,054
Payments for repurchase of equity		$ 17,700,000	$ 14,000,000
Average cost per share (in usd per share)		$ 16.03	$ 24.35
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 8,300,000	$ 26,000,000
Board of Directors Chairman [Member] | Share Repurchase [Member]
Related Party Transaction [Line Items]
Treasury stock acquired, shares	100,000
Payments for repurchase of equity	$ 2,400,000
Average cost per share (in usd per share)	$ 23.85

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Stock Repurchase Program, Authorized Amount, Additional

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The cash outflow to reacquire common and preferred stock.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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