XML 60 R47.htm IDEA: XBRL DOCUMENT v3.19.1
Financial Commitments (Narrative) (Details)
3 Months Ended
Mar. 31, 2019
USD ($)
d / item
$ / shares
shares
May 07, 2019
Dec. 31, 2018
USD ($)
Senior Notes [Member] | Private Placement [Member] | 2017 Senior Notes [Member]      
Debt Instrument [Line Items]      
Face amount $ 500,000,000    
Interest rate 6.875%    
Redemption price, change of control triggering event (as a percent) 101.00%    
Senior Notes [Member] | Circumstance One [Member] | Private Placement [Member] | 2017 Senior Notes [Member]      
Debt Instrument [Line Items]      
Redemption price 100.00%    
Senior Notes [Member] | Circumstance Two [Member] | Private Placement [Member] | 2017 Senior Notes [Member]      
Debt Instrument [Line Items]      
Redemption price 106.875%    
Percentage of notes that can be redeemed 40.00%    
Convertible Notes [Member]      
Debt Instrument [Line Items]      
Face amount $ 200,000,000    
Interest rate 2.875%    
Maturity date Jun. 15, 2021    
Conversion price | $ / shares $ 30.25    
Convertible Notes [Member] | Circumstance One [Member]      
Debt Instrument [Line Items]      
Business day period after consecutive trading day period 5 days    
Consecutive trading day period | d / item 10    
Conversion price, principal amount $ 1,000    
Percentage of conversion price 98.00%    
Convertible Notes [Member] | Circumstance Two [Member]      
Debt Instrument [Line Items]      
Consecutive trading day period | d / item 30    
Percentage of conversion price 130.00%    
Business day period within consecutive trading day period | d / item 20    
Conversion stock price trigger | $ / shares $ 39.32    
Conversion price, shares | shares 33.0579    
Minimum [Member] | 2017 Credit Facility [Member]      
Debt Instrument [Line Items]      
Consolidated leverage ratio 3.25    
Maximum [Member] | 2017 Credit Facility [Member]      
Debt Instrument [Line Items]      
Consolidated leverage ratio     3.50
Credit Facility [Member] | 2017 Credit Facility [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 350,000,000    
Available borrowing capacity 169,000,000    
Additional borrowing $ 150,000,000    
Line of Credit Facility, Expiration Date Apr. 20, 2022    
Applicable margin and letter of credit fees will be increased percentage per annum. 2.00%    
Weighted-average annual interest rate on borrowings 5.28%    
Fixed charge coverage ratio 1.25    
Debt issuance costs $ 4,400,000   $ 4,800,000
Credit Facility [Member] | Letters Of Credit [Member] | 2017 Credit Facility [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity 150,000,000    
Credit Facility [Member] | Swingline Loans [Member] | 2017 Credit Facility [Member]      
Debt Instrument [Line Items]      
Face amount $ 10,000,000    
Credit Facility [Member] | Minimum [Member] | 2017 Credit Facility [Member]      
Debt Instrument [Line Items]      
Consolidated leverage ratio 3.25    
Credit Facility [Member] | Maximum [Member] | 2017 Credit Facility [Member]      
Debt Instrument [Line Items]      
Consolidated leverage ratio 4.00    
LIBOR [Member] | Credit Facility [Member] | Minimum [Member] | 2017 Credit Facility [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent)) 1.50%    
LIBOR [Member] | Credit Facility [Member] | Maximum [Member] | 2017 Credit Facility [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent)) 3.00%    
Base Rate [Member] | Credit Facility [Member] | Circumstance Three [Member] | 2017 Credit Facility [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent)) 1.00%    
Base Rate [Member] | Credit Facility [Member] | Circumstance Four [Member] | 2017 Credit Facility [Member]      
Debt Instrument [Line Items]      
Interest rate 0.00%    
Base Rate [Member] | Credit Facility [Member] | Minimum [Member] | 2017 Credit Facility [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent)) 0.50%    
Base Rate [Member] | Credit Facility [Member] | Maximum [Member] | 2017 Credit Facility [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent)) 2.00%    
Federal Funds Rate [Member] | Credit Facility [Member] | Circumstance Two [Member] | 2017 Credit Facility [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent)) 0.50%    
Subsequent Event [Member] | Credit Facility [Member] | Maximum [Member] | Amendment To 2017 Credit Facility [Member]      
Debt Instrument [Line Items]      
Consolidated leverage ratio   3.50