Shareholders' Equity Stock Repurchase Authorization (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Mar. 14, 2019	Jan. 31, 2019
Class of Stock [Line Items]
Stock repurchase program, authorized amount			$ 50,000	$ 25,000
Stock repurchased during period (in shares)		165,400
Treasury stock acquired, average cost per share (in dollars per share)		$ 47.25
Stock repurchased during period, value		$ 7,814
Stock repurchase program, remaining authorized repurchase amount		$ 25,000
Subsequent Event [Member]
Class of Stock [Line Items]
Stock repurchased during period (in shares)	363,996
Treasury stock acquired, average cost per share (in dollars per share)	$ 47.21
Stock repurchased during period, value	$ 17,200