Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Feb. 07, 2019	Feb. 08, 2017
Stockholders Equity Note [Line Items]
Common stock authorized to be repurchased, number of shares						15,000,000.0	15,000,000.0
Common stock repurchased, shares			2,500,000
Payments for Repurchase of Common Stock			$ 124,998	$ 243,706	$ 0
Repurchase of common stock			124,998	243,706
Common stock dividends, paid per share	$ 0.17	$ 0.16
Payments of Ordinary Dividends, Common Stock			$ (91,694)	$ (88,123)	$ (82,605)
Common Stock and Additional Paid-in Capital
Stockholders Equity Note [Line Items]
Common stock repurchased, shares			2,549,000	4,986,000
Repurchase of common stock			$ 37,819	$ 136,891
Retained Earnings
Stockholders Equity Note [Line Items]
Repurchase of common stock			$ 87,179	$ 106,815