CONDENSED CONSOLIDATING FINANCIAL STATEMENTS - Condensed Consolidating Unaudited Statements Of Cash Flows (Details) (USD $) | 9 Months Ended |
In Thousands, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012 |
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items] | ' | ' |
Net cash provided by operating activities | $157,018 | $265,395 |
CASH FLOWS FROM INVESTING ACTIVITIES: | ' | ' |
Capital expenditures | -111,021 | -399,735 |
Acquisition of the 50% noncontrolling interest in Geostream | -14,600 | 0 |
Intercompany notes and accounts | 0 | 0 |
Other investing activities, net | 7,530 | 12,003 |
Net cash used in investing activities | -118,091 | -387,732 |
Net Cash Provided by (Used in) Financing Activities [Abstract] | ' | ' |
Proceeds from long-term debt | 0 | 205,000 |
Repayment of capital lease obligations | -392 | -1,649 |
Proceeds from borrowings on revolving credit facility | 195,000 | 235,000 |
Repayments on revolving credit facility | -210,000 | -310,000 |
Payment of deferred financing costs | -69 | -4,547 |
Repurchases of common stock | -3,169 | -7,450 |
Intercompany notes and accounts | 0 | 0 |
Other financing activities, net | -1,846 | 12,207 |
Net cash provided by (used in) financing activities | -20,476 | 128,561 |
Effect of changes in exchange rates on cash | 212 | -3,335 |
Cash and Cash Equivalents, Period Increase (Decrease) | 18,663 | 2,889 |
Cash and cash equivalents, beginning of period | 45,949 | 35,443 |
Cash and cash equivalents, end of period | 64,612 | 38,332 |
Parent Company | ' | ' |
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items] | ' | ' |
Net cash provided by operating activities | 0 | 12,904 |
CASH FLOWS FROM INVESTING ACTIVITIES: | ' | ' |
Capital expenditures | 0 | 0 |
Acquisition of the 50% noncontrolling interest in Geostream | 0 | ' |
Intercompany notes and accounts | 0 | 676 |
Other investing activities, net | 0 | -676 |
Net cash used in investing activities | 0 | 0 |
Net Cash Provided by (Used in) Financing Activities [Abstract] | ' | ' |
Proceeds from long-term debt | ' | 205,000 |
Repayment of capital lease obligations | 0 | 0 |
Proceeds from borrowings on revolving credit facility | 195,000 | 235,000 |
Repayments on revolving credit facility | -210,000 | -310,000 |
Payment of deferred financing costs | -69 | -4,547 |
Repurchases of common stock | -3,169 | -7,450 |
Intercompany notes and accounts | 40,620 | -117,609 |
Other financing activities, net | -1,846 | -394 |
Net cash provided by (used in) financing activities | 20,536 | 0 |
Effect of changes in exchange rates on cash | 0 | 0 |
Cash and Cash Equivalents, Period Increase (Decrease) | 20,536 | 12,904 |
Cash and cash equivalents, beginning of period | 39,617 | 21,673 |
Cash and cash equivalents, end of period | 60,153 | 34,577 |
Guarantor Subsidiaries | ' | ' |
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items] | ' | ' |
Net cash provided by operating activities | 153,757 | 239,511 |
CASH FLOWS FROM INVESTING ACTIVITIES: | ' | ' |
Capital expenditures | -106,800 | -386,041 |
Acquisition of the 50% noncontrolling interest in Geostream | -14,600 | ' |
Intercompany notes and accounts | -40,620 | 117,609 |
Other investing activities, net | 7,530 | 12,679 |
Net cash used in investing activities | -154,490 | -255,753 |
Net Cash Provided by (Used in) Financing Activities [Abstract] | ' | ' |
Proceeds from long-term debt | ' | ' |
Repayment of capital lease obligations | -392 | -1,649 |
Proceeds from borrowings on revolving credit facility | 0 | 0 |
Repayments on revolving credit facility | 0 | 0 |
Payment of deferred financing costs | 0 | 0 |
Repurchases of common stock | 0 | 0 |
Intercompany notes and accounts | 0 | -676 |
Other financing activities, net | 0 | 10,914 |
Net cash provided by (used in) financing activities | -392 | 8,589 |
Effect of changes in exchange rates on cash | 0 | 0 |
Cash and Cash Equivalents, Period Increase (Decrease) | -1,125 | -7,653 |
Cash and cash equivalents, beginning of period | 1,601 | 7,985 |
Cash and cash equivalents, end of period | 476 | 332 |
Non-Guarantor Subsidiaries | ' | ' |
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items] | ' | ' |
Net cash provided by operating activities | 3,261 | 12,980 |
CASH FLOWS FROM INVESTING ACTIVITIES: | ' | ' |
Capital expenditures | -4,221 | -13,694 |
Acquisition of the 50% noncontrolling interest in Geostream | ' | ' |
Intercompany notes and accounts | 0 | 0 |
Other investing activities, net | 0 | 0 |
Net cash used in investing activities | -4,221 | -13,694 |
Net Cash Provided by (Used in) Financing Activities [Abstract] | ' | ' |
Proceeds from long-term debt | ' | 0 |
Repayment of capital lease obligations | 0 | 0 |
Proceeds from borrowings on revolving credit facility | 0 | 0 |
Repayments on revolving credit facility | 0 | 0 |
Payment of deferred financing costs | 0 | 0 |
Repurchases of common stock | 0 | 0 |
Intercompany notes and accounts | 0 | 0 |
Other financing activities, net | 0 | 1,687 |
Net cash provided by (used in) financing activities | 0 | 1,687 |
Effect of changes in exchange rates on cash | 212 | -3,335 |
Cash and Cash Equivalents, Period Increase (Decrease) | -748 | -2,362 |
Cash and cash equivalents, beginning of period | 4,731 | 5,785 |
Cash and cash equivalents, end of period | 3,983 | 3,423 |
Eliminations | ' | ' |
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items] | ' | ' |
Net cash provided by operating activities | 0 | 0 |
CASH FLOWS FROM INVESTING ACTIVITIES: | ' | ' |
Capital expenditures | 0 | 0 |
Acquisition of the 50% noncontrolling interest in Geostream | ' | ' |
Intercompany notes and accounts | 40,620 | -118,285 |
Other investing activities, net | 0 | 0 |
Net cash used in investing activities | 40,620 | -118,285 |
Net Cash Provided by (Used in) Financing Activities [Abstract] | ' | ' |
Proceeds from long-term debt | ' | 0 |
Repayment of capital lease obligations | 0 | 0 |
Proceeds from borrowings on revolving credit facility | 0 | 0 |
Repayments on revolving credit facility | 0 | 0 |
Payment of deferred financing costs | 0 | 0 |
Repurchases of common stock | 0 | 0 |
Intercompany notes and accounts | -40,620 | 118,285 |
Other financing activities, net | 0 | 0 |
Net cash provided by (used in) financing activities | -40,620 | 118,285 |
Effect of changes in exchange rates on cash | 0 | 0 |
Cash and Cash Equivalents, Period Increase (Decrease) | 0 | 0 |
Cash and cash equivalents, beginning of period | 0 | 0 |
Cash and cash equivalents, end of period | $0 | $0 |