Note 6. Fixed Assets

The following table summarizes our fixed assets by category at December 31:



(in thousands)	2016			2015
Software	$	124,093		$	110,405
Equipment	11,771			10,679
Land, buildings, and building improvements	7,627			7,627
Leasehold improvements	1,375			1,171
Projects in progress	17,812			17,719
Construction in progress	9,622			—
Total fixed assets, gross	172,300			147,601
Less: Accumulated depreciation	(103,158		)	(88,514		)
Fixed assets, net	$	69,142		$	59,087

The increase in software is primarily related to new electronic signature capabilities for our agents as well as new functionalities to integrate various systems to create a more streamlined process for our customers.

Projects in progress include certain computer software and software developments costs for internal use that are not yet subject to amortization.

On November 11, 2016, we announced the construction of a new office building that will serve as part of our principal headquarters. The costs associated with this project are included in construction in progress. The project is expected to span approximately three years and is financed using a senior secured draw term loan credit facility. See Note 7, "Borrowing Arrangements".

For the years ended December 31, 2016, 2015 and 2014, depreciation and amortization of fixed assets totaled $15.1 million, $15.9 million and $15.7 million, respectively, and is included in all other operating expenses in the Statements of Operations.