Fixed Assets and Asset Retirement Obligations

12 Months Ended

Dec. 31, 2013

Fixed Assets And Asset Retirement Obligations [Abstract]

Fixed Assets and Asset Retirement Obligations

6. Fixed Assets and Asset Retirement Obligations

Fixed Assets

Fixed assets consisted of the following:

	December 31,
	2013			2012
Pipelines and related assets	$	338,920		$	226,831
Machinery and equipment	173,092			87,502
Transportation equipment	19,140			21,170
Marine vessels	554,679			298,054
Land, buildings and improvements	30,170			15,606
Office equipment, furniture and fixtures	5,633			4,964
Construction in progress	183,037			52,541
Other	23,303			16,557
Fixed assets, at cost	1,327,974			723,225
Less: Accumulated depreciation	(199,230		)	(157,944		)
Net fixed assets	$	1,128,744		$	565,281

Depreciation expense was $46.3 million, $37.4 million and $27.5 million for the years ended December 31, 2013, 2012, and 2011, respectively.

Asset Retirement Obligations

A reconciliation of our liability for asset retirement obligations is as follows:

December 31, 2011	$	5,900
Liabilities incurred	5,995
Accretion expense	800
December 31, 2012	12,695
Liabilities incurred	789
Accretion expense	848
December 31, 2013	$	14,332