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Segment Information - EBITDA Reconciliation (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
segment
Jun. 30, 2014
USD ($)
Segment Reporting [Abstract]        
Number of reportable segments | segment     3  
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Adjusted EBITDA $ 80,004 $ 103,152 $ 180,294 $ 205,433
Interest income (expense), net (31) 80 (23) 36
Income tax expense (10,629) (15,852) (21,891) (31,821)
Depreciation and amortization (27,710) (21,895) (51,711) (43,088)
(Loss) gain on sale of assets (687) (154) (871) 87
Foreign currency gain (loss) (2,767) 65 (1,234) 0
Stock-based compensation expense 8,278 15,347 16,288 20,236
Severance and other charges (1,049) 0 (13,022) 0
Income from continuing operations 28,853 50,049 75,254 110,411
Operating segments | International Services        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Adjusted EBITDA 55,311 48,873 107,596 99,902
Operating segments | U.S. Services        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Adjusted EBITDA 16,684 44,968 61,577 86,846
Operating segments | Tubular Sales        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Adjusted EBITDA 7,978 9,311 11,097 18,685
Corporate and other        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Adjusted EBITDA $ 31 $ 0 $ 24 $ 0