Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation (Narrative) (Details)

v3.3.1.900
Share-Based Compensation (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Phantom shares vested 294,184 325,921  
Total liability for share awards $ 25,264,000 $ 34,672,000  
Director Phantom Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid 0 0 $ 0
Phantom shares annual award 80,000 80,000 50,000
Total liability for share awards 4,698,000 5,614,000  
Compensation costs (916,000) (2,193,000) (1,214,000)
Unrecognized compensation cost 200,000    
Employee Phantom Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid 1,682,000 2,401,000 1,404,000
Total liability for share awards 20,566,000 29,058,000  
Compensation costs (1,612,000) $ (11,249,000) $ (7,639,000)
Unrecognized compensation cost $ 10,100,000    
2012 Phantom Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares of phantom stock available for awards 1,000,000