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Summary of Significant Accounting Policies Allowance for Doubtful Accounting Receivable (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Allowance for Doubtful Accounts Receivable, Beginning of the year $ 5us-gaap_AllowanceForDoubtfulAccountsReceivable $ 25us-gaap_AllowanceForDoubtfulAccountsReceivable $ 0us-gaap_AllowanceForDoubtfulAccountsReceivable
Additions charged to earnings 12us-gaap_ProvisionForDoubtfulAccounts (20)us-gaap_ProvisionForDoubtfulAccounts 25us-gaap_ProvisionForDoubtfulAccounts
Uncollectible receivables written off, net of recoveries (2)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs 0us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs 0us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Allowance for Doubtful Accounts Receivable, End of the year $ 17us-gaap_AllowanceForDoubtfulAccountsReceivable $ 5us-gaap_AllowanceForDoubtfulAccountsReceivable $ 25us-gaap_AllowanceForDoubtfulAccountsReceivable