Fair Value Measurements - Hierarchy (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Feb. 01, 2018	Dec. 31, 2017
Assets, Fair Value Disclosure [Abstract]
Finite-lived intangible assets	$ 349,062	$ 52,000	$ 316,504
Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
Total Assets	24,013		13,337
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Total Assets	151		150
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Total Assets	17,365		13,187
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Total Assets	6,497		0
Money Market Funds | Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
Money market funds	151		150
Money Market Funds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Money market funds	151		150
Money Market Funds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Money market funds	0		0
Money Market Funds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Money market funds	0		0
Prepaid expenses and other | Interest rate swap | Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
Interest rate swaps	3,673		2,411
Prepaid expenses and other | Interest rate swap | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Interest rate swaps	0		0
Prepaid expenses and other | Interest rate swap | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Interest rate swaps	3,673		2,411
Prepaid expenses and other | Interest rate swap | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Interest rate swaps	0		0
Deferred charges and other assets, net | Interest rate swap
Assets, Fair Value Disclosure [Abstract]
Interest rate swaps	13,692		10,776
Deferred charges and other assets, net | Interest rate swap | Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
Interest rate swaps	13,692		10,776
Deferred charges and other assets, net | Interest rate swap | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets, Fair Value Disclosure [Abstract]
Interest rate swaps	0		0
Deferred charges and other assets, net | Interest rate swap | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Interest rate swaps	13,692		10,776
Deferred charges and other assets, net | Interest rate swap | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Interest rate swaps	0		$ 0
Option to acquire tangible assets
Assets, Fair Value Disclosure [Abstract]
Finite-lived intangible assets		$ 6,497
Option to acquire tangible assets | Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Finite-lived intangible assets	6,497
Option to acquire tangible assets | Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
Finite-lived intangible assets	$ 6,497