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Earnings Per Share (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Earnings Per Share [Abstract]      
Basic weighted average common shares outstanding 134,934,892us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 132,894,179us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 131,447,895us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities - stock awards 2,416,417us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 2,436,014us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1,869,155us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted weighted average common shares outstanding 137,351,309us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 135,330,193us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 133,317,050us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Common shares issuable upon the exercise of stock options      
Anti-dilutive shares excluded from the calculation of diluted earnings per share      
Number of anti-dilutive shares excluded from the calculation of diluted earnings per share (in shares) 1,200,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember
2,300,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember
3,400,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember