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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net Income $ 28,743 $ 30,711
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 17,526 13,780
Deferred taxes 2,489 5,557
Compensation expense related to share-based compensation plans 4,110 4,191
Gain on sale of assets (60) (10)
Excess tax benefits from share based compensation (33)  
Changes in operating assets and liabilities:    
Restricted investments (295) (1,206)
Accounts receivable, net (11,407) (40,654)
Prepaid taxes 13,284 (165)
Prepaid expenses and other current assets 3,030 (2,063)
Other assets 216 (601)
Accounts payable 15,132 21,756
Accrued expenses 8,943 882
Non-current liabilities (1,226) (537)
Net cash provided by operating activities 80,452 31,641
Cash flows from investing activities:    
Proceeds from sale of equipment 136 319
Purchases of property and equipment (23,716) (46,443)
Net cash used in investing activities (23,580) (46,124)
Cash flows from financing activities:    
Proceeds from issuance of debt 18,548 25,361
Repayments of long term debt (10,938) (2,535)
Stock tendered for payments of withholding taxes (2,877) (3,151)
Purchase of treasury stock (13,419)  
Capital lease payments (1,243) (1,219)
Excess tax benefits from share-based compensation 89 228
Net cash (used in) provided by financing activities (9,840) 18,684
Effect of exchange rate changes on cash and cash equivalents (21) (1)
Net increase in cash and cash equivalents 47,011 4,200
Cash and cash equivalents beginning of the year 109,769 68,964
Cash and cash equivalents end of the year 156,780 73,164
Supplemental disclosures of cash paid for:    
Interest 1,533 738
Income taxes $ 618 $ 10,769