Stock Based Compensation - Narrative (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Share Based Compensation [Abstract]
Forfeiture Rate, Nonvested stock awards	13.00%
Option Award Vesting And Exercisable Period	Most options become exercisable between one and three years after the date of the grant for a period of time determined by the Company not to exceed seven years from the date of grant.
Nonvested Stock Award Vesting Period	Common stock awards issued under the LTIP program are subject only to time vesting over a three to five-year period. In addition, as part of the Company’s Global Annual Incentive Plan (“GAIP”), nonvested shares may be issued to key employees, which generally vest over a two to five-year period.
Outstanding Options, Intrinsic Value	$ 4,761
Exercisable Options, Intrinsic Value	3,505
Option Award Vesting Period	three-year
Share Based Compensation [Line Items]
ESPP: Purchase Price Percentage	85.00%
ESPP: Discount from Market Price	15.00%
ESPP: Maximum Ownership of Outstanding Shares	An employee whose stock ownership of the Company exceeds five percent of the outstanding common stock is not eligible to participate in this plan.
Director Stock Ownership Plan Maximum Number of Shares Authorized Under Plan	75,000
Director Stock Ownership Plan Terms	Currently, each Director who owns less than 7,500 shares of Company Common Stock is required to receive 75% of the annual retainer in Common Stock and 25% of the annual retainer in cash. Each Director who owns 7,500 or more shares of Company Common Stock may elect to receive payment of a percentage (up to 100%) of the annual retainer in shares of common stock. ten years
Director Retainer Annual Fee	40
Restricted Stock LTIP Plan
Share Based Compensation [Line Items]
Unrecognized Share-based Compensation Expense, Nonvested Stock Award	2,469
Weighted Average Remaining Life, Nonvested Stock Awards	2 years 1 month
Restricted Stock Units (RSUs) LTIP Plan
Share Based Compensation [Line Items]
Unrecognized Share-based Compensation Expense, Nonvested Stock Award	62
Weighted Average Remaining Life, Nonvested Stock Awards	2 years 9 months
Options granted in 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Compensation Expense in Period, Stock Option Awards	62
Unrecognized Share-Based Compensation Expense, Stock Option Awards	568
Options granted in 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Share-Based Compensation Expense, Stock Option Awards	263
Options granted in 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Share-Based Compensation Expense, Stock Option Awards	$ 112