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Long-Term Debt Long-term Debt text (Details) $ in Thousands |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 05, 2015 USD ($) | Jun. 15, 2015 Rate | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |
Unamortized Debt Issuance Expense |  |  | $ (19,915) | $ (3,300)
Debt, Weighted Average Interest Rate |  |  | 3.69% |
Letter of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 20,000 |  |  |
$825 Million Term B Loan Facility and $150 Million Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Leverage Ratio | 3.25 |  |  |
Debt Instrument, Face Amount | $ 975,000 |  |  |
$825 Million Term B Loan Facility, due June 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | 825,000 |  |  |
$150 Million Revolving Credit Facility, Due June 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | 150,000 |  |  |
Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Leverage Ratio |  |  | 4.50 |
Leverage Ratio in Latest Year of Debt Term |  |  | 3.25 |
Notes Payable to Banks [Member] | $825 Million Term B Loan Facility and $150 Million Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Increase in Additional Principal Amount | $ 200,000 |  |  |
Notes Payable to Banks [Member] | Minimum [Member] | $150 Million Revolving Credit Facility, Due June 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | Rate |  | 0.75% |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | Rate |  | 0.00% |  |
Notes Payable to Banks [Member] | Maximum [Member] | $150 Million Revolving Credit Facility, Due June 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | Rate |  | 2.50% |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | Rate |  | 0.00% |  |
Notes Payable to Banks [Member] | Maximum [Member] | Eurodollar [Member] | $825 Million Term B Loan Facility, due June 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | Rate |  | 3.00% |  |
Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | $ 96,300 |

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