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Consolidated Statement of Shareholders Equity (USD $) | Total | Stockholders' Equity, Total [Member] | Additional Paid-in Capital [Member] | Treasury Stock [Member] | Retained Earnings [Member] | Common Stock [Member]
--- | --- | --- | --- | --- | --- | ---
Stockholders' Equity Attributable to Parent at Dec. 31, 2011 |  | $ 73,943,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember | $ 77,934,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (13,938,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 9,916,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 31,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Common stock - shares outstanding, beginning balance at Dec. 31, 2011 |  |  |  |  |  | 27,014,845us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Treasury stock - shares, beginning balance at Dec. 31, 2011 |  |  |  | 4,417,585us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  |  |  | 126,604us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Exercise of stock options |  | 1,354,000us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember |  |  |  |
Proceeds from Stock Options Exercised | 1,354,000us-gaap_ProceedsFromStockOptionsExercised |  | 1,354,000us-gaap_ProceedsFromStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures |  |  |  |  |  | 407,398us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock Issued During Period, Value, Restricted Stock Award, Gross |  | (2,813,000)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember | (2,814,000)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 1,000us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Proceeds and Excess Tax Benefit from Share-based Compensation |  | 1,574,000us-gaap_ProceedsAndExcessTaxBenefitFromSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember | 1,574,000us-gaap_ProceedsAndExcessTaxBenefitFromSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Proceeds from Issuance of Warrants | 0us-gaap_ProceedsFromIssuanceOfWarrants |  |  |  |  |
Purchase of convertible bond hedge | 0pro_Purchaseofconvertiblebondhedge |  |  |  |  |
Share-based Compensation | 9,645,000us-gaap_ShareBasedCompensation | 9,645,000us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember | 9,645,000us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |  |  |
Net Income (Loss) Attributable to Parent | 4,966,000us-gaap_NetIncomeLoss | 4,966,000us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember | 0us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 4,966,000us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Net Income (Loss) Attributable to Noncontrolling Interest | 0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  |  |  |  |
Stockholders' Equity Attributable to Parent at Dec. 31, 2012 |  | 88,669,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember | 87,693,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (13,938,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 14,882,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 32,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Common stock - shares outstanding, ending balance at Dec. 31, 2012 |  |  |  |  |  | 27,548,847us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Treasury stock - shares, ending balance at Dec. 31, 2012 |  |  |  | 4,417,585us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  |  |  | 354,973us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Exercise of stock options |  | 3,327,000us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember |  |  |  | 1,000us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Proceeds from Stock Options Exercised | 3,327,000us-gaap_ProceedsFromStockOptionsExercised |  | 3,326,000us-gaap_ProceedsFromStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures |  |  |  |  |  | 284,823us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock Issued During Period, Value, Restricted Stock Award, Gross |  | (3,342,000)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember | (3,342,000)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Proceeds and Excess Tax Benefit from Share-based Compensation |  | 2,931,000us-gaap_ProceedsAndExcessTaxBenefitFromSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember | 2,931,000us-gaap_ProceedsAndExcessTaxBenefitFromSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Proceeds from Issuance of Warrants | 0us-gaap_ProceedsFromIssuanceOfWarrants |  |  |  |  |
Purchase of convertible bond hedge | 0pro_Purchaseofconvertiblebondhedge |  |  |  |  |
Share-based Compensation | 16,272,000us-gaap_ShareBasedCompensation | 16,272,000us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember | 16,272,000us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |  |  |
Net Income (Loss) Attributable to Parent | 3,446,000us-gaap_NetIncomeLoss | 3,446,000us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember | 0us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 3,446,000us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Net Income (Loss) Attributable to Noncontrolling Interest | 0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  |  |  |  |
Stockholders' Equity Attributable to Parent at Dec. 31, 2013 | 111,303,000us-gaap_StockholdersEquity | 111,303,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember | 106,880,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (13,938,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 18,328,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 33,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Common stock - shares outstanding, ending balance at Dec. 31, 2013 | 28,188,643us-gaap_CommonStockSharesOutstanding |  |  |  |  | 28,188,643us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Treasury stock - shares, ending balance at Dec. 31, 2013 | 4,417,585us-gaap_TreasuryStockShares |  |  | 4,417,585us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (2,249,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  |  |  | 214,162us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Exercise of stock options |  | 1,105,000us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember |  |  |  |
Proceeds from Stock Options Exercised | 1,105,000us-gaap_ProceedsFromStockOptionsExercised |  | 1,105,000us-gaap_ProceedsFromStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures |  |  |  |  |  | 644,028us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock Issued During Period, Value, Restricted Stock Award, Gross |  | (13,088,000)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember | (13,089,000)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 1,000us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock Issued During Period, Shares, Employee Stock Purchase Plans | 13,392us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans |  |  |  |  |
Proceeds and Excess Tax Benefit from Share-based Compensation |  | (110,000)us-gaap_ProceedsAndExcessTaxBenefitFromSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember | 335,000us-gaap_ProceedsAndExcessTaxBenefitFromSharebasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Proceeds from Issuance of Warrants | 17,106,000us-gaap_ProceedsFromIssuanceOfWarrants |  |  |  |  |
Change in equity - purchase of convertible bond hedge | (29,411,000)pro_Changeinequitypurchaseofconvertiblebondhedge |  |  |  |  |
Purchase of convertible bond hedge | 29,411,000pro_Purchaseofconvertiblebondhedge |  |  |  |  |
Share-based Compensation | 22,665,000us-gaap_ShareBasedCompensation | 22,845,000us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember | 22,845,000us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | (2,249,000)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |  |  |
Net Income (Loss) Attributable to Parent | (36,644,000)us-gaap_NetIncomeLoss | (37,551,000)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember |  |  |  |
Net Income (Loss) Attributable to Noncontrolling Interest | (907,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  |  |  |  |
Cumulative earnings previously allocated to NCI and re-allocated to Parent's equity | 907,000pro_CumulativeearningspreviouslyallocatedtoNCIandreallocatedtoParentsequity |  |  |  |  |
Stockholders' Equity Attributable to Parent at Dec. 31, 2014 | $ 98,999,000us-gaap_StockholdersEquity | $ 98,999,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_StockholdersEquityTotalMember | $ 134,375,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (13,938,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (19,223,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 34,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Common stock - shares outstanding, ending balance at Dec. 31, 2014 | 29,060,225us-gaap_CommonStockSharesOutstanding |  |  |  |  | 29,060,225us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Treasury stock - shares, ending balance at Dec. 31, 2014 | 4,417,585us-gaap_TreasuryStockShares |  |  | 4,417,585us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |

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