Subsequent Event

3 Months Ended

Mar. 31, 2017

Subsequent Events [Abstract]

Subsequent Event

12. Subsequent Event

On May 2, 2017, the Company completed an offering of convertible senior notes with a principal amount of $175 million maturing in 2024.  In addition, the initial buyers exercised their option to purchase approximately $26 million of additional principal of the notes. The notes are general unsecured obligation of the Company and will accrue interest at a rate of 3.375 %, payable semiannually in arrears.  The notes will be convertible, at the option of the holders if the Company’s stock maintains a price of 130% or greater of the conversion price for a specified period, into cash, shares of the Company’s common stock, or a combination of cash and shares, as determined by the Company.