Stockholders’ Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	$ 286,096	$ 101,842
Net loss	(208,483)	(2,659)
Other comprehensive income (loss)	(17,731)	30,983
Dividends paid	(8,523)	(9,408)
Issuance of common stock	(1,550)	(1,950)
Conversion to common stock		0
Stock-based compensation expense	1,521	6,784
Repurchase of common stock		(39,142)
Balances, end of period	$ 29,430	$ 86,450
Dividends paid (USD per share)	$ 0.05	$ 0.05
Cumulative Effect
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	$ (21,900)
Preferred stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period		$ 1
Balances, end of period		1
Preference stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period		396
Conversion to common stock		(8)
Balances, end of period		388
Common stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	323,338	323,338
Balances, end of period	323,338	323,338
Additional paid-in capital
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	98,748	121,475
Issuance of common stock	(30,716)	(18,925)
Conversion to common stock		(168)
Stock-based compensation expense	1,521	6,784
Balances, end of period	69,553	109,166
Retained earnings
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	5,438,930	5,279,682
Net loss	(208,483)	(2,659)
Dividends paid	(8,523)	(9,408)
Balances, end of period	5,200,024	5,267,615
Retained earnings | Cumulative Effect
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	(21,900)
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	(840,143)	(948,961)
Other comprehensive income (loss)	(17,731)	30,983
Balances, end of period	(857,874)	(917,978)
Treasury stock
Increase (Decrease) in Stockholders' Equity
Balances, beginning of period	(4,734,777)	(4,674,089)
Issuance of common stock	29,166	16,975
Conversion to common stock		176
Repurchase of common stock		(39,142)
Balances, end of period	$ (4,705,611)	$ (4,696,080)