CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' DEFICIT (Parenthetical) - $ / shares |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|---|
| Statement of Stockholders' Equity [Abstract] | |||
| Dividends declared and paid (in dollars per share) | $ 0.9171 | $ 1.4937 | $ 0.6026 |