The amount in the consolidated financial statements of the assets of the group to which significant restrictions (for example, statutory, contractual and regulatory restrictions) apply on the entity's ability to access or use the assets.

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets]

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The amount of financial assets that are measured at fair value through other comprehensive income. A financial asset shall be measured at fair value through other comprehensive income if both of the following conditions are met: (a) the financial asset is held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets and (b) the contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. [Refer: At fair value [member]; Financial assets]

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The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Contingent liabilities [member]; Financial assets]

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The gains (losses) recognised in other comprehensive income on the fair value measurement of assets. [Refer: At fair value [member]; Other comprehensive income]

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The gains (losses) recognised in profit or loss on the fair value measurement of assets. [Refer: At fair value [member]]

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The amount of non-current assets that the entity does not separately disclose in the same statement or note. [Refer: Non-current assets]

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The decrease in the fair value measurement of assets resulting from sales. [Refer: At fair value [member]]

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Other non-current assets (Details) - EUR (€) € in Thousands	12 Months Ended
Other non-current assets (Details) - EUR (€) € in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Available-for-sale financial assets
Financial assets	€ 1,257,329	€ 1,057,309	€ 419,052
Restrictions on sale of investment	0
Amount of investment pledged as collateral for liabilities	0
Reconciliation of fair value remeasurement
Reclassification of fair value adjustment to statement of operations following disposal	55
Net book value at end of period	2,303
Financial assets, class \| Available-for-sale, category
Reconciliation of fair value remeasurement
Costs at beginning of period	2,750
Disposals of the year	(377)
Costs at end of period	2,373
Financial assets, class \| Available-for-sale, category \| Level 1
Reconciliation of fair value remeasurement
Fair value adjustment at beginning of period	(399)
Reclassification of fair value adjustment to statement of operations following disposal	55
Fair value adjustment of the year	(275)
Fair value adjustment at end of period	(619)
Net book value at end of period	€ 1,754