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Long-Term Debt Narrative (Details) - USD ($)
 6 Months Ended
Jun. 30, 2015
Mar. 09, 2015
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Mar. 24, 2014
Debt Instrument [Line Items]            
Face amount $ 200,000,000   $ 200,000,000 $ 200,000,000 $ 200,000,000  
Senior Notes            
Debt Instrument [Line Items]            
Face amount           $ 200,000,000
Stated interest rate (percent)           6.75%
Line of Credit | 2014 Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 160,000,000   160,000,000      
Expiration date Feb. 05, 2019          
Amount outstanding $ 56,000,000   56,000,000      
Remaining borrowing capacity $ 104,000,000   $ 104,000,000      
Interest rate at end of period (percent) 2.69%   2.69%      
Net proceeds     $ 33,600,000      
Line of Credit | 2014 Credit Facility | 30-day LIBOR            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent) 2.50%          
Line of Credit | 2014 Credit Facility | Prime Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent) 1.50%          
Line of Credit | Mexico Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 10,000,000        
Expiration date   Dec. 09, 2017        
Remaining borrowing capacity $ 10,000,000   $ 10,000,000      
Commitment fee amount   $ 25,000        
Line of Credit | Mexico Credit Facility | 30-day LIBOR            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent)   2.00%