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Stock Compensation - Compensation Costs (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Mar. 31, 2013
Executive Officer
Sep. 30, 2013
Chief Executive Officer
Sep. 30, 2013
Employee 1998 Plan:
Sep. 30, 2012
Employee 1998 Plan:
Sep. 30, 2013
NDSI Plan
Sep. 30, 2012
NDSI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unamortized cost associated with nonvested stock grants $ 4,138              
Weighted average period of recognition 30 months              
Expensed     (485) (2,271) 17 3,898 384 286
Capitalized         245 281    
Compensation cost $ 646 $ 4,465     $ 262 $ 4,179