FIXED ASSETS, NET

Fixed assets, net consist of the following (in thousands):



	December 31,
	2016			2015
Computer hardware and software, including internal-use software and website development	$	196,923		$	175,701
Building	67,892			44,811
Furniture and equipment	15,931			11,396
Land	12,781			10,861
Building machinery and equipment	7,915			—
Leasehold improvements	7,062			7,753
Land improvements	6,356			—
	314,860			250,522
Less: accumulated depreciation	(180,308		)	(156,826		)
Total fixed assets, net	$	134,552		$	93,696

Depreciation of fixed assets totaled $27.3 million, $23.5 million, and $18.0 million for the years ended December 31, 2016, 2015 and 2014, respectively. During 2016, we retired $2.0 million of fully depreciated fixed assets that were removed from service in 2016.

Upon sale or retirement of assets, cost and related accumulated depreciation and amortization are removed from the balance sheet and the resulting gain or loss, if any, is reflected in the consolidated statements of income.

Fixed assets included assets under capital leases and finance obligations of $21.5 million and $10.0 million at December 31, 2016 and 2015, respectively. Accumulated depreciation related to assets under capital leases and finance obligations was $8.7 million and $4.6 million at December 31, 2016 and 2015, respectively.

Depreciation expense of assets recorded under capital leases and finance obligations was $4.1 million, $1.6 million and $707,000 for the years ended December 31, 2016, 2015 and 2014, respectively.