Preferred Stock (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Temporary Equity [Line Items]
Preferred Stock, Shares Issued | shares	120,000
Preferred Stock, Liquidation Preference, Value | $	$ 120.0
Preferred Stock, Value, Issued | $	$ 142.0
Preferred Stock, Dividend Rate, Percentage	8.00%
Preferred stock annual dividends | $	$ 9.6
Total shares available for issuance (in shares) | shares	5,393,000
Preferred Stock Initial Conversion Price per Share | $ / shares	$ 22.25
Common Stock [Member]
Temporary Equity [Line Items]
Shares issued upon conversion (in shares) | shares	44.9438