CONDENSED CONSOLIDATING FINANCIAL STATEMENTS - Condensed Consolidating Unaudited Statements Of Cash Flows (Details) (USD $) | 6 Months Ended |
In Thousands, unless otherwise specified | Jun. 30, 2014 | Jun. 30, 2013 |
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items] | ' | ' |
Net cash provided by operating activities | $107,268 | $46,681 |
CASH FLOWS FROM INVESTING ACTIVITIES: | ' | ' |
Capital expenditures | -69,429 | -72,577 |
Acquisition of the 50% noncontrolling interest in Geostream | 0 | -14,600 |
Intercompany notes and accounts | 0 | 0 |
Other investing activities, net | 9,389 | 3,881 |
Net cash used in investing activities | -60,040 | -83,296 |
Net Cash Provided by (Used in) Financing Activities [Abstract] | ' | ' |
Repayments of long-term debt | -3,573 | 0 |
Repayment of capital lease obligations | 0 | -379 |
Proceeds from borrowings on revolving credit facility | 115,000 | 155,000 |
Repayments on revolving credit facility | -160,000 | -135,000 |
Payment of deferred financing costs | 0 | -69 |
Repurchases of common stock | -2,211 | -3,134 |
Intercompany notes and accounts | 0 | 0 |
Other financing activities, net | -1,221 | -1,501 |
Net cash provided by (used in) financing activities | -52,005 | 14,917 |
Effect of changes in exchange rates on cash | -81 | 484 |
Net decrease in cash and cash equivalents | -4,858 | -21,214 |
Cash and cash equivalents, beginning of period | 28,306 | 45,949 |
Cash and cash equivalents, end of period | 23,448 | 24,735 |
Parent Company | ' | ' |
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 | ' | 0 |
Intercompany notes and accounts | 0 | 0 |
Other investing activities, net | 0 | 0 |
Net cash used in investing activities | 0 | 0 |
Net Cash Provided by (Used in) Financing Activities [Abstract] | ' | ' |
Repayments of long-term debt | -3,573 | ' |
Repayment of capital lease obligations | ' | 0 |
Proceeds from borrowings on revolving credit facility | 115,000 | 155,000 |
Repayments on revolving credit facility | -160,000 | -135,000 |
Payment of deferred financing costs | ' | -69 |
Repurchases of common stock | -2,211 | -3,134 |
Intercompany notes and accounts | 41,350 | -36,539 |
Other financing activities, net | -1,221 | -1,501 |
Net cash provided by (used in) financing activities | -10,655 | -21,243 |
Effect of changes in exchange rates on cash | 0 | 0 |
Net decrease in cash and cash equivalents | -10,655 | -21,243 |
Cash and cash equivalents, beginning of period | 23,115 | 39,617 |
Cash and cash equivalents, end of period | 12,460 | 18,374 |
Guarantor Subsidiaries | ' | ' |
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items] | ' | ' |
Net cash provided by operating activities | 100,170 | 45,284 |
CASH FLOWS FROM INVESTING ACTIVITIES: | ' | ' |
Capital expenditures | -66,280 | -69,413 |
Acquisition of the 50% noncontrolling interest in Geostream | ' | -14,600 |
Intercompany notes and accounts | -41,350 | 36,539 |
Other investing activities, net | 9,389 | 3,881 |
Net cash used in investing activities | -98,241 | -43,593 |
Net Cash Provided by (Used in) Financing Activities [Abstract] | ' | ' |
Repayments of long-term debt | 0 | ' |
Repayment of capital lease obligations | ' | -379 |
Proceeds from borrowings on revolving credit facility | 0 | 0 |
Repayments on revolving credit facility | 0 | 0 |
Payment of deferred financing costs | ' | 0 |
Repurchases of common stock | 0 | 0 |
Intercompany notes and accounts | 0 | 0 |
Other financing activities, net | 0 | 0 |
Net cash provided by (used in) financing activities | 0 | -379 |
Effect of changes in exchange rates on cash | 0 | 0 |
Net decrease in cash and cash equivalents | 1,929 | 1,312 |
Cash and cash equivalents, beginning of period | 788 | 1,601 |
Cash and cash equivalents, end of period | 2,717 | 2,913 |
Non-Guarantor Subsidiaries | ' | ' |
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items] | ' | ' |
Net cash provided by operating activities | 7,098 | 1,397 |
CASH FLOWS FROM INVESTING ACTIVITIES: | ' | ' |
Capital expenditures | -3,149 | -3,164 |
Acquisition of the 50% noncontrolling interest in Geostream | ' | 0 |
Intercompany notes and accounts | 0 | 0 |
Other investing activities, net | 0 | 0 |
Net cash used in investing activities | -3,149 | -3,164 |
Net Cash Provided by (Used in) Financing Activities [Abstract] | ' | ' |
Repayments of long-term debt | 0 | ' |
Repayment of capital lease obligations | ' | 0 |
Proceeds from borrowings on revolving credit facility | 0 | 0 |
Repayments on revolving credit facility | 0 | 0 |
Payment of deferred financing costs | ' | 0 |
Repurchases of common stock | 0 | 0 |
Intercompany notes and accounts | 0 | 0 |
Other financing activities, net | 0 | 0 |
Net cash provided by (used in) financing activities | 0 | 0 |
Effect of changes in exchange rates on cash | -81 | 484 |
Net decrease in cash and cash equivalents | 3,868 | -1,283 |
Cash and cash equivalents, beginning of period | 4,403 | 4,731 |
Cash and cash equivalents, end of period | 8,271 | 3,448 |
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 | ' | 0 |
Intercompany notes and accounts | 41,350 | -36,539 |
Other investing activities, net | 0 | 0 |
Net cash used in investing activities | 41,350 | -36,539 |
Net Cash Provided by (Used in) Financing Activities [Abstract] | ' | ' |
Repayments of long-term debt | 0 | ' |
Repayment of capital lease obligations | ' | 0 |
Proceeds from borrowings on revolving credit facility | 0 | 0 |
Repayments on revolving credit facility | 0 | 0 |
Payment of deferred financing costs | ' | 0 |
Repurchases of common stock | 0 | 0 |
Intercompany notes and accounts | -41,350 | 36,539 |
Other financing activities, net | 0 | 0 |
Net cash provided by (used in) financing activities | -41,350 | 36,539 |
Effect of changes in exchange rates on cash | 0 | 0 |
Net decrease in cash and cash equivalents | 0 | 0 |
Cash and cash equivalents, beginning of period | 0 | 0 |
Cash and cash equivalents, end of period | $0 | $0 |