As of December 31, 2013, the Company’s material contractual obligations are as follows (in thousands):



	Total		2014		2015		2016		2017		2018		Thereafter
Contractual obligations (1)
Imputed financing obligation (2)	$	40,260	$	5,874	$	6,010	$	6,156	$	6,302	$	6,447	$	9,471
Leases and other contractual obligations	8,456		3,753		2,108		1,237		1,018		340		—
Software licenses (3)	8,715		5,477		2,865		373		—		—		—
Acquisition retention bonuses (4)	18,083		18,013		70		—		—				—
Convertible notes	310,500		172,500		—		—		—		138,000		—
Interest payments related to convertible notes	12,076		5,865		1,553		1,553		1,553		1,552		—
Total	$	398,090	$	211,482	$	12,606	$	9,319	$	8,873	$	146,339	$	9,471

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(1)

The above table does not reflect possible payments in connection with uncertain tax benefits of approximately $18.8 million including $12.6 million recorded as a reduction of long-term deferred tax assets and $6.2 million in long-term income taxes payable, as of December 31, 2013. As noted below in Note 17, “Income Taxes,” although it is possible that some of the unrecognized tax benefits could be settled within the next 12 months, the Company cannot reasonably estimate the outcome at this time.

(2)

With respect to the imputed financing obligation, the main components of the difference between the amount reflected in the contractual obligations table and the amount reflected on the Consolidated Balance Sheets are the interest on the imputed financing obligation and the estimated common area expenses over the future periods. Additionally, the amount includes the amended Ohio lease and the amended Sunnyvale lease.


(3)	The Company has commitments with various software vendors for non-cancellable license agreements generally having terms longer than one year. The above table summarizes those contractual obligations as of December 31, 2013 which are also presented on the Company’s Consolidated Balance Sheet under current and other long-term liabilities.


(4)	In connection with acquisitions, the Company is obligated to pay retention bonuses to certain employees and contractors, subject to certain eligibility and acceleration provisions including the condition of employment. The remaining $16.9 million of CRI retention bonuses payable on June 3, 2014 will be paid in cash or stock at the Company’s election.