Shareholders' Equity Stock Repurchase Authorization (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 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)	(364,000)	165,000	529,396
Treasury stock acquired, average cost per share (in dollars per share)			$ 47.22
Stock repurchased during period, value	$ 17,186	$ 7,814	$ 25,000
Stock repurchase program, remaining authorized repurchase amount	$ 25,000		$ 25,000