Equity (Details) - shares	12 Months Ended
	Dec. 31, 2016	Jul. 19, 2016	Jul. 18, 2016	Dec. 31, 2015	Apr. 20, 2015	Apr. 20, 2009	Jan. 31, 2008
Class of Stock [Line Items]
Preferred stock, shares authorized	2,000,000			2,000,000	2,000,000	200,000
Preferred stock, shares issued	0			0
Preferred stock, shares outstanding	0
Common sock, shares authorized	100,000,000	100,000,000	60,000,000	60,000,000
Common Stock
Class of Stock [Line Items]
Stock repurchased during the period	0
Common Stock
Class of Stock [Line Items]
Number of shares authorized to be repurchased							500,000
Number of remaining shares authorized to be repurchased	500,000