Consolidated Statement of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 22,254	$ 93,113
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	127,359	126,610
Amortization of debt financing costs	7,800	10,022
Amortization of debt discount	2,242	2,997
Reorganization items; debt discount and issuance costs write-off	37,129
Non-cash gain on debt extinguishment	(10,814)	(4,409)
Accelerated deferred mobilization income	(21,508)
Deferred income tax expense (benefit)	2,122	(305)
Loss on disposal of assets	1,108	3,008
Changes in operating assets and liabilities:
Restricted cash		2,125
Trade receivables	80,903	12,399
Inventory	1,397	(10,088)
Prepaid expenses and other current assets	5,991	(4,660)
Other assets	8,549	5,275
Accounts payable	(154,922)	(40,580)
Accrued liabilities and other long-term liabilities	(17,023)	44,217
Net cash provided by operating activities	92,587	239,724
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to property and equipment	(46,490)	(35,693)
Net cash used in investing activities	(46,490)	(35,693)
CASH FLOWS FROM FINANCING ACTIVITIES
Repayment of long-term debt	(67,980)	(167,561)
Distributions to VDC	(498)	(995)
Proceeds from (repayment of) revolving credit agreement, net	150,000	(10,000)
Net cash provided by (used in) financing activities	81,522	(178,556)
Net increase in cash and cash equivalents	127,619	25,475
Cash and cash equivalents—beginning of year	75,801	50,326
Cash and cash equivalents—end of year	203,420	75,801
Cash paid for:
Interest	124,295	194,561
Income taxes	50,840	27,734
Non-cash investing and financing transactions:
Note issued in acquisition of management entities	61,477
Trade-in value on equipment upgrades		$ 922
Contributions from VDC	$ 10,326