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Borrowings (Narrative) (Details) (USD $)
 1 Months Ended 6 Months Ended
Nov. 30, 2011
Jun. 30, 2014
item
Jun. 30, 2013
Borrowings [Abstract]      
Principal amount of convertible notes $ 152,000,000    
Interest rate 5.50%    
Debt instrument periodic payment payable in cash semi-annually on June 15 and December 15 of each year    
Converted number of common stock shares   69.9032  
Conversion ratio per $1 of principal   1  
Convertible note, conversion rate per share   $ 14.31  
Amount of notes converted   0 63,420,000
Number shares that the notes are convertible   876,000  
Debt maturity date   Dec. 15, 2016  
Notes issued with an effective yield   5.96%  
Original issue discount   98.00%  
Convertible notes capitalized costs   6,634,000  
Proceeds from issuance of notes   $ 145,366,000  
Redeemable convertible securities maximum, shares   1,118,000  
Redeemable convertible securities price per share   $ 11.22