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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
Common Stock and Additional Paid-in-Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Deficiency [Member]
Total
BALANCE at Dec. 31, 2013 $ 440,479us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
$ (18,712)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ (359,883)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 61,884us-gaap_StockholdersEquity
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net loss 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(3,573)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(3,573)us-gaap_NetIncomeLoss
Share-based compensation expense 499us-gaap_ShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
0us-gaap_ShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_ShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
499us-gaap_ShareBasedCompensation
Tax impact of forfeited vested shares (253)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
0us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(253)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
Other comprehensive income 0us-gaap_OtherComprehensiveIncomeOtherNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
333us-gaap_OtherComprehensiveIncomeOtherNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_OtherComprehensiveIncomeOtherNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
333us-gaap_OtherComprehensiveIncomeOtherNetOfTax
BALANCE at Mar. 31, 2014 440,725us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
(18,379)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(363,456)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
58,890us-gaap_StockholdersEquity
BALANCE at Dec. 31, 2014 442,631us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
(49,638)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(362,190)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
30,803us-gaap_StockholdersEquity
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net loss 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(588)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(588)us-gaap_NetIncomeLoss
Share-based compensation expense 663us-gaap_ShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
0us-gaap_ShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_ShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
663us-gaap_ShareBasedCompensation
Tax impact of forfeited vested shares (363)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
0us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(363)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
Other comprehensive income 0us-gaap_OtherComprehensiveIncomeOtherNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
1,274us-gaap_OtherComprehensiveIncomeOtherNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_OtherComprehensiveIncomeOtherNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
1,274us-gaap_OtherComprehensiveIncomeOtherNetOfTax
BALANCE at Mar. 31, 2015 $ 442,931us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember
$ (48,364)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ (362,778)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 31,789us-gaap_StockholdersEquity