Consolidated Statements of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Cash Flows [Abstract]
Compensation expense for stock awards	$ 1,321us-gaap_RestrictedStockExpense	$ 802us-gaap_RestrictedStockExpense	$ 695us-gaap_RestrictedStockExpense
Stock option expense	$ 1,274us-gaap_StockOptionPlanExpense	$ 1,437us-gaap_StockOptionPlanExpense	$ 1,093us-gaap_StockOptionPlanExpense

The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Name:	us-gaap_RestrictedStockExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration