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Long-Term Debt (Details) (USD $)
 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Term-B Loan Facility due May 2020
Feb. 28, 2014
Term-B Loan Facility due May 2020
Dec. 31, 2013
Term-B Loan Facility due May 2020
May 16, 2013
Term-B Loan Facility due May 2020
Mar. 31, 2014
Revolving Credit Facility due May 2018
Dec. 31, 2013
Revolving Credit Facility due May 2018
May 16, 2013
Revolving Credit Facility due May 2018
May 16, 2013
Term A Loans, Term B Loans and Revolving Loans
Mar. 31, 2014
Term-A Loan Facility due May 2018
Feb. 28, 2014
Term-A Loan Facility due May 2018
Dec. 31, 2013
Term-A Loan Facility due May 2018
May 16, 2013
Term-A Loan Facility due May 2018
Mar. 31, 2014
Eurodollar [Member]
Term-B Loan Facility due May 2020
Mar. 31, 2014
Maximum [Member]
Mar. 31, 2014
Maximum [Member]
Revolving Credit Facility due May 2018
Mar. 31, 2014
Maximum [Member]
Eurodollar Rate or Base Rate
Revolving Loans and Term A Loans
Mar. 31, 2014
Minimum [Member]
Revolving Credit Facility due May 2018
Mar. 31, 2014
Minimum [Member]
Eurodollar Rate or Base Rate
Revolving Loans and Term A Loans
Debt Disclosure [Abstract]                                        
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year $ 13,687,000                                      
Long-term Debt, Maturities, Repayments of Principal in Year Two 18,250,000                                      
Long-term Debt, Maturities, Repayments of Principal in Year Three 18,250,000                                      
Long-term Debt, Maturities, Repayments of Principal in Year Four 18,250,000                                      
Long-term Debt, Maturities, Repayments of Principal in Year Five 145,063,000                                      
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five 180,313,000                                      
Debt Instrument [Line Items]                                        
Senior Secured Debt 393,813,000 399,813,000 180,313,000   262,813,000   41,000,000 44,500,000     172,500,000   92,500,000              
Line of Credit Facility, Maximum Borrowing Capacity                 125,000,000 500,000,000                    
Debt Instrument, Face Amount           275,000,000               100,000,000            
Proceeds from Issuance of Long-term Debt                       82,500,000                
Repayments of Long-term Debt       82,500,000                                
Line of Credit Facility, Increase in Additional Principal Amount                   100,000,000                    
Line of Credit Facility, Remaining Borrowing Capacity             $ 81,000,000                          
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum                             1.00%          
Debt Instrument, Basis Spread on Variable Rate                             2.50%     2.50%   1.75%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage                                 0.40%   0.25%  
Debt Instrument, Interest Rate at Period End     3.50%       2.20%       2.20%                  
Debt, Weighted Average Interest Rate 2.80%                                      
Leverage Ratio 2.12                             4.00        
Leverage Ratio in Latest Year of Debt Term                               3.25        
Pledged equity interest in foreign subsidiaries 65.00%