CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Sep. 30, 2017	Dec. 31, 2016	[1]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	53,391,948	53,148,441
Common stock, shares outstanding (in shares)	53,391,948	53,148,441
Convertible Notes Payable
Stated interest rate	3.75%	3.75%
Face amount of the Notes	$ 143,750,000	$ 143,750,000

[1] Derived from the audited December 31, 2016 financial statements