Consolidated Statements of Stockholders' Equity (Deficit) (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Purchase and retirement of common stock, shares	119,823,621	85,141,691	23,406,472
Dividends declared on common stock per share (in dollars per share)	$ 0.40	$ 0.40	$ 0.20
Issuance of shares of common stock pursuant to employee stock plans	2,506,067	12,289,537	5,701,776
Issuance of shares of post-reorganization common stock, shares			57,393,096
Issuance of shares for Optional Conversion of Preferred Shares, shares			130,980,613