CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (unaudited) (Parenthetical)	3 Months Ended
Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Preferred stock dividend (in percent)	9.00%

The percentage rate used to calculate dividend payments on preferred stock.

No definition available.

Name:	us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration