Leases and Leases Commitments - Additional Information (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Lease	Sep. 30, 2018 USD ($)	Jan. 01, 2019 USD ($)
Lessee Lease Description [Line Items]
Options to extend the leases	5 years			5 years
Operating cash flows used for operating leases				$ 30,235
Total operating lease expense	$ 9,700		$ 7,500	28,600	$ 22,500
Short-term leases expense	800			2,900
Operating lease assets	$ 165,300			$ 165,300
Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List	us-gaap:OtherAssetsMember			us-gaap:OtherAssetsMember
Mooring Equipment [Member]
Lessee Lease Description [Line Items]
Number of operating leases not yet commenced | Lease				2
Mooring Equipment Lease Entered in First Quarter [Member]
Lessee Lease Description [Line Items]
Operating lease payments, lease not yet commenced		$ 12,000
Lease term of lease expected to commence		9 years 6 months
Mooring Equipment Lease Entered in Third Quarter [Member]
Lessee Lease Description [Line Items]
Operating lease payments, lease not yet commenced				$ 5,000
Lease term of lease expected to commence	5 years			5 years
ASU 2016-02 [Member]
Lessee Lease Description [Line Items]
Operating lease assets						$ 146,800
ASU 2016-02 [Member] | Sale and Lease-back Equipment [Member]
Lessee Lease Description [Line Items]
Operating lease term	10 years			10 years
Options to extend the leases	5 years			5 years
Operating cash flows used for operating leases				$ 26,000
Sale lease back transaction renewal term description				Renewal options for two successive five-year periods.
Sale leaseback transaction service period				ten-year
ASU 2016-02 [Member] | Prepaid Expenses and Other Current Assets [Member]
Lessee Lease Description [Line Items]
Prepaid rent						3,900
ASU 2016-02 [Member] | Other Assets [Member]
Lessee Lease Description [Line Items]
Prepaid rent						$ 10,600
Minimum [Member]
Lessee Lease Description [Line Items]
Operating lease term	1 month			1 month
Maximum [Member]
Lessee Lease Description [Line Items]
Operating lease term	10 years			10 years
Options to terminate the leases				1 year