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NET INCOME (LOSS) PER COMMON SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Basic (loss) income per share    
Net (loss) income $ (11,633)us-gaap_NetIncomeLoss $ 17,939us-gaap_NetIncomeLoss
Denominator (in shares) 59,560,873us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 57,545,862us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic net (loss) income per share (in dollars per share) $ (0.20)us-gaap_EarningsPerShareBasic $ 0.31us-gaap_EarningsPerShareBasic
Numerator:    
Net (loss) income $ (11,633)us-gaap_NetIncomeLoss $ 17,939us-gaap_NetIncomeLoss
Denominator:    
Denominator (in shares) 59,560,873us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 57,545,862us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Add effect of dilutive securities:    
Stock options and equivalents   2,377,000depo_DilutiveSecuritiesNumberStockOptionsAndRestrictiveStockUnits
Denominator for diluted net (loss) income per share (in shares) 59,560,873us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 59,923,083us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted net (loss) income per share (in dollars per share) $ (0.20)us-gaap_EarningsPerShareDiluted $ 0.30us-gaap_EarningsPerShareDiluted
Total number of antidilutive shares excluded from the diluted net income (loss) per share 21,957,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 800,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
2021 Notes    
Add effect of dilutive securities:    
Total number of antidilutive shares excluded from the diluted net income (loss) per share 17,931,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertibleDebtMember		  
Stock options and equivalents    
Add effect of dilutive securities:    
Total number of antidilutive shares excluded from the diluted net income (loss) per share 4,026,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= depo_OutstandingStockOptionUnvestedRsuAndEsppContributionMember		 800,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= depo_OutstandingStockOptionUnvestedRsuAndEsppContributionMember