Long-Term Debt - Other (Narrative) (Details) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2018 USD ($) term_loan	Dec. 31, 2017 USD ($) term_loan
Debt Instrument [Line Items]
Carrying amount of debt	$ 3,189,841	$ 3,123,728
Weighted-average interest rate	4.80%	4.10%
Aggregate annual long-term debt principal repayments required to be made, remainder of 2018	$ 115,200
Aggregate annual long-term debt principal repayments required to be made, 2019	536,800
Aggregate annual long-term debt principal repayments required to be made, 2020	349,000
Aggregate annual long-term debt principal repayments required to be made, 2021	303,000
Aggregate annual long-term debt principal repayments required to be made, 2022	596,300
Aggregate annual long-term debt principal repayments required to be made, thereafter	$ 1,337,500
Number of debt instruments \| term_loan	1	3
Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate annual long-term debt principal repayments required to be made, remainder of 2018	$ 37,800
Aggregate annual long-term debt principal repayments required to be made, 2019	148,100
Aggregate annual long-term debt principal repayments required to be made, 2020	100,000
Aggregate annual long-term debt principal repayments required to be made, 2021	100,000
Aggregate annual long-term debt principal repayments required to be made, 2022	$ 175,000
Number of debt instruments \| term_loan	1
Term Loan
Debt Instrument [Line Items]
Number of debt instruments \| term_loan	7
Minimum \| Collateralized Debt Obligations
Debt Instrument [Line Items]
Required ratio of asset value to outstanding drawn principal balance	100.00%
Actual ratio of asset value to outstanding drawn principal balance	119.88%
Maximum \| Collateralized Debt Obligations
Debt Instrument [Line Items]
Required ratio of asset value to outstanding drawn principal balance	125.00%
Actual ratio of asset value to outstanding drawn principal balance	414.14%
Interest rate swaps \| Minimum
Debt Instrument [Line Items]
Margin (as a percent)	0.90%	0.90%
Interest rate swaps \| Maximum
Debt Instrument [Line Items]
Margin (as a percent)	4.30%	3.75%
ALP
Debt Instrument [Line Items]
Carrying amount of debt	$ 80,900
Fixed interest rate	2.93%

Number of debt instruments.

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Vessel Market Value To Loan Ratio

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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Weighted average interest rate of long-term debt outstanding calculated at point in time.

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