Earnings Per Share (Details) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Reconciliation of shares used for basic and diluted earnings per share [Abstract]
Shares used for basic EPS (in shares)	18,857	18,829	18,851	18,824
Dilutive effect of stock-based awards (in shares)	74	116	70	112
Shares used for diluted EPS (in shares)	18,931	18,945	18,921	18,936
Stock-based awards not included in diluted per share calculations as they would be anti-dilutive (in shares)	109	61	78	52