Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Consolidated Statements of Cash Flows (Parenthetical)

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Consolidated Statements of Cash Flows (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consolidated Statements of Cash Flows [Abstract]      
Fair value of assets acquired, cash acquired $ 6,502us-gaap_CashAcquiredFromAcquisition $ 3,405us-gaap_CashAcquiredFromAcquisition $ 41,524us-gaap_CashAcquiredFromAcquisition