Long-Term Debt (Narrative) (Details) (USD $) | 3 Months Ended | |
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 |
Debt Instrument [Line Items] | | | |
Proceeds from revolving credit facilities | $243,250,000 | $781,114,000 | |
Revolving credit facility [Member] | | | |
Debt Instrument [Line Items] | | | |
Debt instrument, maturity date | 31-Jul-19 | | |
Credit facility, maximum borrowing capacity | 1,050,000,000 | | |
Proceeds from revolving credit facilities | 300,000,000 | | |
Revolving credit facility [Member] | U.S. [Member] | | | |
Debt Instrument [Line Items] | | | |
Credit facility, maximum borrowing capacity | 977,000,000 | | |
Revolving credit facility [Member] | Canada [Member] | | | |
Debt Instrument [Line Items] | | | |
Credit facility, maximum borrowing capacity | 20,000,000 | | |
Revolving credit facility [Member] | United Kingdom [Member] | | | |
Debt Instrument [Line Items] | | | |
Credit facility, maximum borrowing capacity | 5,000,000 | | |
Revolving credit facility [Member] | Australia [Member] | | | |
Debt Instrument [Line Items] | | | |
Credit facility, maximum borrowing capacity | 10,000,000 | | |
Revolving credit facility [Member] | Netherlands [Member] | | | |
Debt Instrument [Line Items] | | | |
Credit facility, maximum borrowing capacity | 4,000,000 | | |
Revolving credit facility [Member] | Belgium [Member] | | | |
Debt Instrument [Line Items] | | | |
Credit facility, maximum borrowing capacity | 4,000,000 | | |
Revolving credit facility [Member] | Norway [Member] | | | |
Debt Instrument [Line Items] | | | |
Credit facility, maximum borrowing capacity | 30,000,000 | | |
Global ABL Facility [Member] | | | |
Debt Instrument [Line Items] | | | |
Debt instrument, interest rate | 1.74% | | 1.84% |
Credit facility, remaining borrowing capacity | 386,300,000 | | |
Senior Secured Term Loan B [Member] | | | |
Debt Instrument [Line Items] | | | |
New Term Loan | 793,500,000 | | |
Debt maturity period | 7 years | | |
Term loan annual amortization percentage | 1.00% | | |
Debt instrument, maturity date | 30-Nov-19 | | |
Term Loan accordion feature | $200,000,000 | | |
Percentage of capital stock in foreign subsidiaries securing Term Loan B | 65.00% | | |
Debt instrument, interest rate | 5.10% | | 5.10% |
Senior Secured Term Loan B [Member] | Senior Secured Leverage Ratio Is No More Than 2.75 to 1.00 [Member] | | | |
Debt Instrument [Line Items] | | | |
Senior secured leverage ratio | 2.75 | | |
Repayment of Term Loan, percentage | 25.00% | | |
Senior Secured Term Loan B [Member] | Senior Secured Leverage Ratio Is No More Than 2.50 to 1.00 [Member] | | | |
Debt Instrument [Line Items] | | | |
Senior secured leverage ratio | 2.5 | | |
Repayment of Term Loan, percentage | 0.00% | | |
Senior Secured Term Loan B [Member] | Maximum [Member] | | | |
Debt Instrument [Line Items] | | | |
Senior secured leverage ratio | 3.5 | | |
Repayment of Term Loan, percentage | 50.00% | | |