Long-term Debt Narrative (Details) (USD $)										1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Senior Notes [Member]	Dec. 31, 2013 Senior Notes [Member]	May 13, 2013 Senior Notes [Member] China Merchants Bank Co. (CMB) [Member]	Mar. 31, 2014 Revolving Credit Facility [Member]	Dec. 31, 2013 Revolving Credit Facility [Member]	Mar. 31, 2014 Brazil Bank Debt [Member]	Dec. 31, 2013 Brazil Bank Debt [Member]	Mar. 31, 2010 Revolving Credit Facility [Member] China Merchants Bank Co. (CMB) [Member]	Mar. 31, 2014 Revolving Credit Facility [Member] China Merchants Bank Co. (CMB) [Member]	Mar. 31, 2010 Revolving Credit Facility [Member] China Merchants Bank Co. (CMB) [Member] Eurodollar Borrowing [Member]	Mar. 31, 2014 Revolving Credit Facility [Member] China Merchants Bank Co. (CMB) [Member] Eurodollar Borrowing [Member]
Debt Instrument [Line Items]
Carrying value of long-term debt and lease obligations	$ 241,013,000	$ 220,152,000	$ 175,000,000	$ 175,000,000		$ 50,000,000	$ 35,000,000	$ 5,649,000	$ 0
Long-term Debt and Interest Rate Caps (Textual) [Abstract]
Principal amount of debt					175,000,000	50,000,000		5,600,000
Stated rate on debt					8.125%
Revolving line of credit, Maximum											175,000,000
Outstanding term loan indebtedness under Credit Facility											$ 50,000,000
Interest rate debt accrued per annum											2.56%
Debt instrument basis spread on variable rate under option one											0.50%	3.50%	2.40%
Debt instrument basis spread on variable rate under option two											1.00%
Debt instrument basis spread on variable rate under option three										2.50%	1.40%
Fixed charge coverage ratio											1.125
Leverage ratio											3.25
Percentage of tangible net worth for covenants compliance										60.00%
Average rate on long-term debt								15.68%