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Long-Term Debt - Maturities Of Long-Term Debt (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Aug. 31, 2002
Dec. 31, 2016
Nov. 01, 2016
Dec. 31, 2015
Mar. 31, 2012
Debt Instrument [Line Items]          
Less than one year   $ 67,571      
One to two years   208,870      
Two to three years   42,572      
Three to four years   96,486      
Four to five years   7,560      
Over five years   233,965      
Total debt   657,024      
Less current maturities   (67,571)   $ (71,640)  
Long-term debt, less current maturities   589,453      
Unamortized debt discounts   (19,094)      
Unamortized debt issuance costs   (11,963)   (11,993)  
Long-term debt   558,396   677,695  
Term Loan Maturing June 2018 [Member]          
Debt Instrument [Line Items]          
Less than one year   25,634      
One to two years   166,624      
Two to three years   0      
Three to four years   0      
Four to five years   0      
Over five years   0      
Total debt   192,258   255,000  
Less current maturities   (25,634)      
Long-term debt, less current maturities   166,624      
Unamortized debt discounts   0      
Unamortized debt issuance costs   (1,391)      
Long-term debt   165,233      
Convertible Senior Notes Maturing May 2022 [Member]          
Debt Instrument [Line Items]          
Less than one year   0      
One to two years   0      
Two to three years   0      
Three to four years   0      
Four to five years   0      
Over five years   125,000      
Total debt   125,000 $ 125,000 0  
Less current maturities   0      
Long-term debt, less current maturities   125,000      
Unamortized debt discounts   (16,513) $ (16,900)    
Unamortized debt issuance costs   (2,790)      
Long-term debt   105,697      
Convertible Senior Notes Maturing March 2032 [Member]          
Debt Instrument [Line Items]          
Less than one year   0      
One to two years   0      
Two to three years   0      
Three to four years   0      
Four to five years   0      
Over five years   60,115      
Total debt   60,115   200,000 $ 200,000
Less current maturities   0      
Long-term debt, less current maturities   60,115      
Unamortized debt discounts   (2,581)   (14,963) $ (35,400)
Unamortized debt issuance costs   (231)      
Long-term debt   $ 57,303      
Maturity date   March 2032      
MARAD Debt Maturing February 2027 [Member]          
Debt Instrument [Line Items]          
Less than one year   $ 6,222      
One to two years   6,532      
Two to three years   6,858      
Three to four years   7,200      
Four to five years   7,560      
Over five years   48,850      
Total debt   83,222   89,148  
Less current maturities   (6,222)      
Long-term debt, less current maturities   77,000      
Unamortized debt discounts   0      
Unamortized debt issuance costs   (5,001)      
Long-term debt   71,999      
Maturity date February 2027        
Nordea Q5000 Loan Maturing April 2020 [Member]          
Debt Instrument [Line Items]          
Less than one year   35,715      
One to two years   35,714      
Two to three years   35,714      
Three to four years   89,286      
Four to five years   0      
Over five years   0      
Total debt   196,429   $ 232,143  
Less current maturities   (35,715)      
Long-term debt, less current maturities   160,714      
Unamortized debt discounts   0      
Unamortized debt issuance costs   (2,550)      
Long-term debt   $ 158,164