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Consolidated Statement of Stockholders' Equity (USD $)
Total
Common Stock [Member]
Additional Paid In Capital [Member]
Retained Earnings [Member]
Balances at Dec. 31, 2014 $ 218,078,000us-gaap_StockholdersEquity $ 167,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 217,419,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ 492,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Increase (Decrease) in Stockholders' Equity        
Net loss 5,509,000us-gaap_ProfitLoss 0us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 0us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 5,509,000us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Cash dividend declared (9,239,000)us-gaap_DividendsCommonStockCash 0us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 (3,238,000)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 (6,001,000)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Issuance of common shares pursuant to equity compensation plan 189,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 189,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Amortization of equity plan compensation 34,000orc_AmortizationOfEquityAwards 0orc_AmortizationOfEquityAwards
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 34,000orc_AmortizationOfEquityAwards
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0orc_AmortizationOfEquityAwards
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Stock Issued During Period, Value, New Issues (16,175,000)us-gaap_StockIssuedDuringPeriodValueNewIssues 12,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 16,163,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balances at Mar. 31, 2015 $ 230,746,000us-gaap_StockholdersEquity $ 179,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 230,567,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ 0us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember