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Stock Compensation - Compensation Costs (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
Executive Officer
Jun. 30, 2013
Chief Executive Officer
Jun. 30, 2013
Employee 1998 Plan:
Jun. 30, 2012
Employee 1998 Plan:
Jun. 30, 2013
NDSI Plan
Jun. 30, 2012
NDSI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unamortized cost associated with nonvested stock grants $ 3,693              
Weighted average period of recognition 31 months              
Expensed     (485) (2,271) (952) 3,475 384 183
Capitalized         208 167    
Compensation cost $ (360) $ 3,825     $ (744) $ 3,642