1、 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington,D.C.20549 Form 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31,2016 Commission File Number 1-12804 (Exact name of registrant as specified in its charter)Delawar
2、e 86-0748362(State or other jurisdiction of incorporation or organization)(I.R.S.Employer Identification No.)4646 E.Van Buren Street,Suite 400 Phoenix,Arizona 85008(Address of principal executive offices)(Zip Code)(480)894-6311(Registrants telephone number,including area code)Securities registered p
3、ursuant to Section 12(b)of the Act:Title of each class Name of each exchange on which registered Common Stock,$.01 par value Nasdaq Global Select Market Preferred Share Purchase Rights Securities registered pursuant to Section 12(g)of the Act:None Indicate by check mark if the registrant is a well-k
4、nown seasoned issuer,as defined in Rule 405 of the Securities Act.Yes No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d)of the Act.Yes No Indicate by check mark whether the registrant(1)has filed all reports required to be filed by Sec
5、tion 13 or 15(d)of the Securities Exchange Act of 1934 during the preceding 12 months(or for such shorter period that the registrant was required to file such reports),and(2)has been subject to such filing requirements for the past 90 days.Yes No Indicate by check mark whether the registrant has sub
6、mitted electronically and posted on its corporate Web site,if any,every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T(232.405 of this chapter)during the preceding 12 months(or for such shorter period that the registrant was required to submit and po