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Long-Term Debt (Narrative) (Details) - USD ($)		6 Months Ended	12 Months Ended
Long-Term Debt (Narrative) (Details) - USD ($)	Jul. 02, 2016	Jun. 30, 2018	Dec. 31, 2016	Dec. 31, 2017	Jul. 01, 2016
Disclosure Long Term Debt Additional Information [Line Items]
Long-term debt		$ 617,730,000		$ 630,597,000
Debt instrument orderly liquidation value of registered trademarks percentage benchmark		10.00%
Interest Rate Cap [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Derivative, notional amount		$ 500,000,000	$ 500,000,000
Derivative, cap interest rate			1.50%
Derivative, maturity date		Nov. 23, 2018	Nov. 23, 2018
Revolving Credit Facility [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Line of credit facility, maximum borrowing capacity					$ 110,000,000
Line of credit facility, unused capacity, commitment fee percentage		0.375%
BoA Credit Agreement [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument period of credit agreement		5 years
Proceeds from issuance of long-term debt	$ 287,500,000
Long-term debt					258,000,000
Debt instrument covenant payment percentage of intellectual property disposed liquidation value		50.00%
Debt instrument covenant payment percentage of net proceeds related to other assets constituting collateral		100.00%
Debt instrument, covenant description		(i) maintain a positive net income (as defined in the agreement), (ii) satisfy a maximum loan to value ratio set at 50.0% (applicable to the Revolving Loans and Tranche A Loans) and (iii) satisfy a maximum consolidated first lien leverage ratio, initially set at 2.80:1.00, decreasing over the term of the Amended BoA Credit Agreement until reaching the final maximum ratio of 2.50:1.00 for the fiscal quarter ending September 30, 2018 and thereafter.
Debt instrument, description		(i) the loans outstanding under the Amended BoA Credit Agreement plus, (a) where intellectual property is disposed, 50.0% of the disposed intellectual property's orderly liquidation value, and (b) where any other assets constituting collateral are disposed or upon the receipt of certain insurance proceeds, 100% of the net proceeds thereof, subject to certain reinvestment rights; and (ii) the Tranche A-1 Loans to the extent that the outstanding principal amount thereof exceeds 10.0% of the orderly liquidation value of the registered trademarks owned by the BoA Facility Loan Parties.
Debt instrument, covenant compliance		At June 30, 2018, the Company is in compliance with the covenants included in the Amended BoA Credit Agreement.
BoA Term Loans [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Long-term debt		$ 537,157,000		551,913,000
Debt instrument, periodic payment		$ 5,000,000
Debt instrument, date of first required payment		Sep. 30, 2016
Tranche A [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Maximum loan to value ratio		50.00%
Tranche A [Member] \| Notes Payable to Banks [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument, face amount					133,000,000
Long-term debt					133,000,000
Tranche A [Member] \| Notes Payable to Banks [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument, basis spread on variable rate		3.50%
Tranche A [Member] \| Notes Payable to Banks [Member] \| Base Rate [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument, basis spread on variable rate		2.50%
Tranche A [Member] \| Revolving Credit Facility [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Line of credit facility, covenant terms		(i) the Revolving Credit Facility and Tranche A Loans as would not cause the consolidated first lien leverage ratio, determined on a pro forma basis after giving effect to any such increase, to exceed 2.33:1.00 and (ii) the Tranche A-1 Loans, as would not cause the consolidated first lien leverage ratio, determined on a pro forma basis after giving effect to any such increase, to exceed (a) with respect to any increase, the proceeds of which will be used solely to finance an acquisition, 2.50:100 and (b) with respect to any other increase, 2.40:1.00, subject to the satisfaction of certain conditions in the Amended BoA Credit Agreement.
Tranche A -1 Term Loans [Member] \| Scenario Plan Two [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Consolidated first lien leverage ratio		2.50%
Tranche A -1 Term Loans [Member] \| Scenario Plan Three [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Consolidated first lien leverage ratio		2.40%
Tranche A -1 Term Loans [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument, basis spread on variable rate		7.00%
Tranche A -1 Term Loans [Member] \| Base Rate [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument, basis spread on variable rate		6.00%
Tranche A -1 Term Loans [Member] \| Notes Payable to Banks [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument, face amount					44,500,000
Long-term debt					44,500,000
Revolving Loans [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Long-term debt		$ 92,787,000		$ 92,787,000	80,500,000
Maximum loan to value ratio		50.00%
Revolving Loans [Member] \| Notes Payable to Banks [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument, basis spread on variable rate		3.50%
Revolving Loans [Member] \| Notes Payable to Banks [Member] \| Base Rate [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument, basis spread on variable rate		2.50%
GSO Credit Agreement [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument covenant payment percentage of intellectual property disposed liquidation value	50.00%
Debt instrument covenant payment percentage of net proceeds related to other assets constituting collateral	100.00%
Debt instrument, date of first required payment		Mar. 31, 2017
Consolidated first lien leverage ratio		2.80%
Debt instrument, covenant description		(a) in the event the consolidated total leverage ratio is at least 4.00:1.00, 75% thereof, (b) in the event the consolidated total leverage ratio is less than 4.00:1.00 but at least 3.00:1.00, 50% thereof and (c) in the event the consolidated total leverage ratio is less than 3.00:1.00, 0% thereof. On March 31, 2017, the loans under the Amended FS/KKR Credit Agreement commenced amortization in quarterly installments, equal to 2.00% per annum of the original aggregate principal amount thereof.
Debt instrument consolidated total leverage ratio		7.25%
Amortization percentage for quarterly installments of the original aggregate principal amount		2.00%
Line of credit facility, interest rate description		(i) the LIBOR rate plus an applicable margin of 8.25% or 9.00% per annum or (ii) the base rate plus an applicable margin of 7.25% or 8.00% per annum, in each case based upon the consolidated total leverage ratio.
Debt instrument, covenant compliance		At June 30, 2018, the Company is in compliance with the covenants included in the Amended FS/KKR Credit Agreement.
Debt instrument, debt default, description of violation or event of default		The Amended FS/KKR Credit Agreement contains certain customary events of default, including a change of control. If an event of default occurs and is not cured within any applicable grace period or is not waived, the FS/KKR Agent, at the request of the lenders under the Amended FS/KKR Credit Agreement, is required to take various actions, including, without limitation, the acceleration of amounts due thereunder.
GSO Credit Agreement [Member] \| Scenario, Plan [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Consolidated first lien leverage ratio		2.50%
Debt instrument consolidated total leverage ratio		6.50%
GSO Credit Agreement [Member] \| Scenario Plan One [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument consolidated total leverage ratio		6.00%
GSO Credit Agreement [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument, basis spread on variable rate		8.25%
GSO Credit Agreement [Member] \| Base Rate [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument, basis spread on variable rate		7.25%
GSO Credit Agreement [Member] \| Additional Loan Facility [Member] \| Scenario, Plan [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument consolidated total leverage ratio		6.00%
GSO Credit Agreement Reinvestment Rights Scenario One [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument covenant payment percentage of net proceeds related to other assets constituting collateral		75.00%
GSO Credit Agreement Reinvestment Rights Scenario Two [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument covenant payment percentage of net proceeds related to other assets constituting collateral		50.00%
GSO Credit Agreement Reinvestment Rights Scenario Three [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument covenant payment percentage of net proceeds related to other assets constituting collateral		0.00%
Amended KKR Credit Agreement [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument, face amount					$ 415,000,000
Maximum [Member] \| Revolving Credit Facility [Member] \| Scenario Plan One [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Consolidated first lien leverage ratio		2.33%
Maximum [Member] \| BoA Credit Agreement [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Consolidated first lien leverage ratio		2.80%
Maximum [Member] \| Tranche A [Member] \| Scenario Plan One [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Consolidated first lien leverage ratio		2.33%
Maximum [Member] \| GSO Credit Agreement [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument, interest rate, stated percentage		9.00%
Maximum [Member] \| GSO Credit Agreement [Member] \| Base Rate [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument, interest rate, stated percentage		8.00%
Maximum [Member] \| GSO Credit Agreement Reinvestment Rights Scenario Two [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument consolidated total leverage ratio		4.00%
Maximum [Member] \| GSO Credit Agreement Reinvestment Rights Scenario Three [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument consolidated total leverage ratio		3.00%
Minimum [Member] \| BoA Credit Agreement [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Consolidated first lien leverage ratio		2.50%
Minimum [Member] \| GSO Credit Agreement Reinvestment Rights Scenario One [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument consolidated total leverage ratio		4.00%
Minimum [Member] \| GSO Credit Agreement Reinvestment Rights Scenario Two [Member]
Disclosure Long Term Debt Additional Information [Line Items]
Debt instrument consolidated total leverage ratio		3.00%