Share-Based Compensation (Options) (Details) - Stock options $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) $ / shares shares
Number of Shares
Options outstanding, beginning balance (in shares) | shares	570
Options exercised (in shares) | shares	(3)
Options outstanding, ending balance (in shares) | shares	567
Weighted-Average Exercise Price
Options outstanding, beginning balance (usd per share) | $ / shares	$ 20.17
Options exercised (usd per share) | $ / shares	22.10
Options outstanding, ending balance (usd per share) | $ / shares	$ 20.17
Weighted Average Remaining Contractual Term
Options outstanding, Weighted Average Remaining Contractual Term (in years)	2 years 9 months 18 days
Aggregate Intrinsic Value
Options outstanding, Aggregate Intrinsic Value | $	$ 9,699