Condensed Consolidated Statements of Stockholders' Equity (Deficit) (Parenthetical) - $ / shares shares in Thousands	3 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share (in dollars per share)	$ 0.45	$ 0.45	$ 0.40	$ 0.40
Purchase of shares of common stock under share repurchase program (in shares)	697,255	872,317	960,105	407,091