Supplemental Cash Flow Disclosure (Tables)

12 Months Ended

Dec. 31, 2014

Supplemental Cash Flow Elements [Abstract]

Schedule of Depreciation and Amortization Expense

Depreciation and amortization expense is comprised of the following (in thousands):

	Year Ended December 31,
	2014		2013		2012
Depreciation and amortization from continuing operations	$	115,819	$	119,624	$	116,384
Depreciation and amortization from discontinued operations	—		4,923		13,102
Total depreciation and amortization expense	$	115,819	$	124,547	$	129,486