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Debt and Credit Facility Debt and Credit Facility, Narrative (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | May 15, 2016 USD ($) | May 23, 2012 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense |  | $ 6,800,000 |  | $ 6,800,000 |  |  |  |
Long-term debt | [1] | $ 368,200,000 |  | $ 368,200,000 |  | $ 194,600,000 |  |
Senior Notes Due 2024 [Member] | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 6.10% |  | 6.10% |  |  |  |
Consolidated Total Indebtedness to EBITDA Ratio |  |  |  | 2.75 |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 375,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 5.875% |
Debt issuance, percentage of principal amount |  |  |  |  |  |  | 100.00% |
Interest Expense, Long-term Debt |  | $ 3,100,000 |  | $ 3,100,000 |  |  |  |
Debt Instrument, Fair Value Disclosure |  | 383,400,000 |  | 383,400,000 |  |  |  |
Senior Notes Due 2020 [Member] | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 225,000,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 8.25%
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  | 27,200,000 |  |
Long-term debt |  | 197,800,000 |  | 197,800,000 |  | $ 197,800,000 |  |
Interest Expense, Long-term Debt |  | 2,800,000 | $ 4,900,000 | 7,100,000 | $ 9,700,000 |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  |  | 107.50% |  |
Repayments of Debt |  |  |  | 214,200,000 |  |  |  |
Redemption Premium |  |  |  | 8,200,000 |  |  |  |
Write off of Deferred Debt Issuance Cost |  |  |  | 2,900,000 |  |  |  |
Debt Instrument, Fair Value Disclosure |  |  |  |  |  | $ 207,300,000 |  |
Revolving Credit Facility [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 300,000,000 |  | 300,000,000 |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | 287,600,000 |  | 287,600,000 |  |  |  |
Long-term Line of Credit |  | 0 |  | 0 |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 280,300,000 |  | $ 280,300,000 |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  | 3.75% |  | 3.75% |  |  |  |
Revolving Credit Facility [Member] | Letter of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term Line of Credit |  | $ 7,300,000 |  | $ 7,300,000 |  |  |  |
Upon receipt of the proceeds of certain asset sales [Member] | Senior Notes Due 2024 [Member] | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 100.00% |  |  |  |
On or after May 15, 2019 [Member] | Senior Notes Due 2024 [Member] | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 104.406% |  |  |  |
On or after May 15, 2020 [Member] | Senior Notes Due 2024 [Member] | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 102.938% |  |  |  |
On or after May 15, 2021 [Member] | Senior Notes Due 2024 [Member] | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 101.469% |  |  |  |
On or after June 1, 2016 [Member] | Senior Notes Due 2020 [Member] | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 104.125% |  |  |  |  |  |
On or after May 15, 2022 [Member] | Senior Notes Due 2024 [Member] | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 100.00% |  |  |  |
Any time prior to May 15, 2019 [Member] | Senior Notes Due 2024 [Member] | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 100.00% |  |  |  |
Exchange Offer Registration Timeline |  |  |  | 240 days |  |  |  |
Change in control [Member] | Senior Notes Due 2024 [Member] | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 101.00% |  |  |  |
[1] | See Note 1 for discussion of our adoption of ASU 2015-03, ASU 2015-15 and ASU 2015-17 (as defined in Note 1).

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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